diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 078af19..07afb00 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1789,10 +1789,8 @@
     int		force_bin;	/* 0, FORCE_BIN or FORCE_NOBIN */
     int		read_edit;	/* ++edit argument */
     int		force_ff;	/* ++ff= argument (first char of argument) */
-#ifdef FEAT_MBYTE
     int		force_enc;	/* ++enc= argument (index in cmd[]) */
     int		bad_char;	/* BAD_KEEP, BAD_DROP or replacement byte */
-#endif
 #ifdef FEAT_USR_CMDS
     int		useridx;	/* user command index */
 #endif
diff --git a/src/getchar.c b/src/getchar.c
index 0f81979..ff1b06b 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -291,14 +291,11 @@
     static void
 add_char_buff(buffheader_T *buf, int c)
 {
-#ifdef FEAT_MBYTE
     char_u	bytes[MB_MAXBYTES + 1];
     int		len;
     int		i;
-#endif
     char_u	temp[4];
 
-#ifdef FEAT_MBYTE
     if (IS_SPECIAL(c))
 	len = 1;
     else
@@ -307,7 +304,6 @@
     {
 	if (!IS_SPECIAL(c))
 	    c = bytes[i];
-#endif
 
 	if (IS_SPECIAL(c) || c == K_SPECIAL || c == NUL)
 	{
@@ -333,9 +329,7 @@
 	    temp[1] = NUL;
 	}
 	add_buff(buf, temp, -1L);
-#ifdef FEAT_MBYTE
     }
-#endif
 }
 
 /* First read ahead buffer. Used for translated commands. */
@@ -596,12 +590,10 @@
 	    break;
 
 	/* Handle a special or multibyte character. */
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    /* Handle composing chars separately. */
 	    c = mb_cptr2char_adv(&s);
 	else
-#endif
 	    c = *s++;
 	if (c < ' ' || c == DEL || (*s == NUL && (c == '0' || c == '^')))
 	    add_char_buff(&redobuff, Ctrl_V);
@@ -686,11 +678,7 @@
 	}
 	else
 	{
-#ifdef FEAT_MBYTE
 	    c = mb_ptr2char_adv(&s);
-#else
-	    c = *s++;
-#endif
 	    if (c == CAR || c == NL || c == ESC)
 		c = ' ';
 	    stuffcharReadbuff(c);
@@ -732,11 +720,9 @@
     static buffblock_T	*bp;
     static char_u	*p;
     int			c;
-#ifdef FEAT_MBYTE
     int			n;
     char_u		buf[MB_MAXBYTES + 1];
     int			i;
-#endif
 
     if (init)
     {
@@ -752,7 +738,6 @@
     if ((c = *p) != NUL)
     {
 	/* Reverse the conversion done by add_char_buff() */
-#ifdef FEAT_MBYTE
 	/* For a multi-byte character get all the bytes and return the
 	 * converted character. */
 	if (has_mbyte && (c != K_SPECIAL || p[1] == KS_SPECIAL))
@@ -760,7 +745,6 @@
 	else
 	    n = 1;
 	for (i = 0; ; ++i)
-#endif
 	{
 	    if (c == K_SPECIAL) /* special key or escaped K_SPECIAL */
 	    {
@@ -776,7 +760,6 @@
 		bp = bp->b_next;
 		p = bp->b_str;
 	    }
-#ifdef FEAT_MBYTE
 	    buf[i] = c;
 	    if (i == n - 1)	/* last byte of a character */
 	    {
@@ -787,7 +770,6 @@
 	    c = *p;
 	    if (c == NUL)	/* cannot happen? */
 		break;
-#endif
 	}
     }
 
@@ -1093,11 +1075,7 @@
     void
 ins_char_typebuf(int c)
 {
-#ifdef FEAT_MBYTE
     char_u	buf[MB_MAXBYTES + 1];
-#else
-    char_u	buf[4];
-#endif
     if (IS_SPECIAL(c))
     {
 	buf[0] = K_SPECIAL;
@@ -1106,14 +1084,7 @@
 	buf[3] = NUL;
     }
     else
-    {
-#ifdef FEAT_MBYTE
 	buf[(*mb_char2bytes)(c, buf)] = NUL;
-#else
-	buf[0] = c;
-	buf[1] = NUL;
-#endif
-    }
     (void)ins_typebuf(buf, KeyNoremap, 0, !KeyTyped, cmd_silent);
 }
 
@@ -1579,11 +1550,9 @@
 vgetc(void)
 {
     int		c, c2;
-#ifdef FEAT_MBYTE
     int		n;
     char_u	buf[MB_MAXBYTES + 1];
     int		i;
-#endif
 
 #ifdef FEAT_EVAL
     /* Do garbage collection when garbagecollect() was called previously and
@@ -1763,7 +1732,6 @@
 	    case K_XRIGHT:	c = K_RIGHT; break;
 	}
 
-#ifdef FEAT_MBYTE
 	/* For a multi-byte character get all the bytes and return the
 	 * converted character.
 	 * Note: This will loop until enough bytes are received!
@@ -1794,7 +1762,6 @@
 	    --no_mapping;
 	    c = (*mb_ptr2char)(buf);
 	}
-#endif
 
 	break;
       }
@@ -2212,7 +2179,6 @@
 					break;
 				}
 
-#ifdef FEAT_MBYTE
 				/* Don't allow mapping the first byte(s) of a
 				 * multi-byte char.  Happens when mapping
 				 * <M-a> and then changing 'encoding'. Beware
@@ -2225,7 +2191,6 @@
 					  && MB_BYTE2LEN(c1) > MB_PTR2LEN(p2))
 					mlen = 0;
 				}
-#endif
 				/*
 				 * Check an entry whether it matches.
 				 * - Full match: mlen == keylen
@@ -2685,38 +2650,29 @@
 					curwin->w_wcol = vcol;
 				    vcol += lbr_chartabsize(ptr, ptr + col,
 							       (colnr_T)vcol);
-#ifdef FEAT_MBYTE
 				    if (has_mbyte)
 					col += (*mb_ptr2len)(ptr + col);
 				    else
-#endif
 					++col;
 				}
 				curwin->w_wrow = curwin->w_cline_row
 					   + curwin->w_wcol / curwin->w_width;
 				curwin->w_wcol %= curwin->w_width;
 				curwin->w_wcol += curwin_col_off();
-#ifdef FEAT_MBYTE
 				col = 0;	/* no correction needed */
-#endif
 			    }
 			    else
 			    {
 				--curwin->w_wcol;
-#ifdef FEAT_MBYTE
 				col = curwin->w_cursor.col - 1;
-#endif
 			    }
 			}
 			else if (curwin->w_p_wrap && curwin->w_wrow)
 			{
 			    --curwin->w_wrow;
 			    curwin->w_wcol = curwin->w_width - 1;
-#ifdef FEAT_MBYTE
 			    col = curwin->w_cursor.col - 1;
-#endif
 			}
-#ifdef FEAT_MBYTE
 			if (has_mbyte && col > 0 && curwin->w_wcol > 0)
 			{
 			    /* Correct when the cursor is on the right halve
@@ -2726,7 +2682,6 @@
 			    if ((*mb_ptr2cells)(ptr + col) > 1)
 				--curwin->w_wcol;
 			}
-#endif
 		    }
 		    setcursor();
 		    out_flush();
@@ -3434,7 +3389,6 @@
 	     * Otherwise we won't be able to find the start of it in a
 	     * vi-compatible way.
 	     */
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		int	first, last;
@@ -3458,9 +3412,7 @@
 		    goto theend;
 		}
 	    }
-	    else
-#endif
-		if (vim_iswordc(keys[len - 1]))	/* ends in keyword char */
+	    else if (vim_iswordc(keys[len - 1]))  // ends in keyword char
 		    for (n = 0; n < len - 2; ++n)
 			if (vim_iswordc(keys[n]) != vim_iswordc(keys[len - 2]))
 			{
@@ -4458,9 +4410,7 @@
 #ifdef FEAT_LOCALMAP
     mapblock_T	*mp2;
 #endif
-#ifdef FEAT_MBYTE
     int		clen = 0;	/* length in characters */
-#endif
     int		is_id = TRUE;
     int		vim_abbr;
 
@@ -4480,7 +4430,6 @@
     if (col == 0)				/* cannot be an abbr. */
 	return FALSE;
 
-#ifdef FEAT_MBYTE
     if (has_mbyte)
     {
 	char_u *p;
@@ -4508,7 +4457,6 @@
 	scol = (int)(p - ptr);
     }
     else
-#endif
     {
 	if (!vim_iswordc(ptr[col - 1]))
 	    vim_abbr = TRUE;			/* Vim added abbr. */
@@ -4601,7 +4549,6 @@
 		{
 		    if (c < ABBR_OFF && (c < ' ' || c > '~'))
 			tb[j++] = Ctrl_V;	/* special char needs CTRL-V */
-#ifdef FEAT_MBYTE
 		    if (has_mbyte)
 		    {
 			/* if ABBR_OFF has been added, remove it here */
@@ -4610,7 +4557,6 @@
 			j += (*mb_char2bytes)(c, tb + j);
 		    }
 		    else
-#endif
 			tb[j++] = c;
 		}
 		tb[j] = NUL;
@@ -4637,10 +4583,8 @@
 
 	    tb[0] = Ctrl_H;
 	    tb[1] = NUL;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 		len = clen;	/* Delete characters instead of bytes */
-#endif
 	    while (len-- > 0)		/* delete the from string */
 		(void)ins_typebuf(tb, 1, 0, TRUE, mp->m_silent);
 	    return TRUE;
@@ -4715,13 +4659,7 @@
     /* Need a buffer to hold up to three times as much.  Four in case of an
      * illegal utf-8 byte:
      * 0xc0 -> 0xc3 0x80 -> 0xc3 K_SPECIAL KS_SPECIAL KE_FILLER */
-    res = alloc((unsigned)(STRLEN(p) *
-#ifdef FEAT_MBYTE
-			4
-#else
-			3
-#endif
-			    ) + 1);
+    res = alloc((unsigned)(STRLEN(p) * 4) + 1);
     if (res != NULL)
     {
 	d = res;
@@ -5012,7 +4950,6 @@
 
     for ( ; *str != NUL; ++str)
     {
-#ifdef FEAT_MBYTE
 	char_u	*p;
 
 	/* Check for a multi-byte character, which may contain escaped
@@ -5026,7 +4963,6 @@
 	    --str;
 	    continue;
 	}
-#endif
 
 	c = *str;
 	/*
diff --git a/src/glbl_ime.cpp b/src/glbl_ime.cpp
index af13ad2..91d52ed 100644
--- a/src/glbl_ime.cpp
+++ b/src/glbl_ime.cpp
@@ -134,7 +134,7 @@
     if (pIApp == NULL || pIApp->OnDefWindowProc(hWnd, Msg,
 					    wParam, lParam, &lResult) != S_OK)
     {
-#if defined(WIN3264) && defined(FEAT_MBYTE)
+#if defined(WIN3264)
 	if (wide_WindowProc)
 	    lResult = DefWindowProcW(hWnd, Msg, wParam, lParam);
 	else
diff --git a/src/globals.h b/src/globals.h
index ef3764c..355b4bb 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -44,7 +44,6 @@
 EXTERN unsigned	*LineOffset INIT(= NULL);
 EXTERN char_u	*LineWraps INIT(= NULL);	/* line wraps to next line */
 
-#ifdef FEAT_MBYTE
 /*
  * When using Unicode characters (in UTF-8 encoding) the character in
  * ScreenLinesUC[] contains the Unicode for the character at this position, or
@@ -61,7 +60,6 @@
 /* Only used for euc-jp: Second byte of a character that starts with 0x8e.
  * These are single-width. */
 EXTERN schar_T	*ScreenLines2 INIT(= NULL);
-#endif
 
 /*
  * Indexes for tab page line:
@@ -798,41 +796,38 @@
 EXTERN JMP_BUF x_jump_env;
 #endif
 
-#if defined(FEAT_MBYTE) || defined(FEAT_POSTSCRIPT)
 /*
  * These flags are set based upon 'fileencoding'.
  * Note that "enc_utf8" is also set for "unicode", because the characters are
  * internally stored as UTF-8 (to avoid trouble with NUL bytes).
  */
-# define DBCS_JPN	932	/* japan */
-# define DBCS_JPNU	9932	/* euc-jp */
-# define DBCS_KOR	949	/* korea */
-# define DBCS_KORU	9949	/* euc-kr */
-# define DBCS_CHS	936	/* chinese */
-# define DBCS_CHSU	9936	/* euc-cn */
-# define DBCS_CHT	950	/* taiwan */
-# define DBCS_CHTU	9950	/* euc-tw */
-# define DBCS_2BYTE	1	/* 2byte- */
-# define DBCS_DEBUG	-1
-#endif
+#define DBCS_JPN	932	/* japan */
+#define DBCS_JPNU	9932	/* euc-jp */
+#define DBCS_KOR	949	/* korea */
+#define DBCS_KORU	9949	/* euc-kr */
+#define DBCS_CHS	936	/* chinese */
+#define DBCS_CHSU	9936	/* euc-cn */
+#define DBCS_CHT	950	/* taiwan */
+#define DBCS_CHTU	9950	/* euc-tw */
+#define DBCS_2BYTE	1	/* 2byte- */
+#define DBCS_DEBUG	-1
 
-#ifdef FEAT_MBYTE
 EXTERN int	enc_dbcs INIT(= 0);		/* One of DBCS_xxx values if
 						   DBCS encoding */
 EXTERN int	enc_unicode INIT(= 0);	/* 2: UCS-2 or UTF-16, 4: UCS-4 */
 EXTERN int	enc_utf8 INIT(= FALSE);		/* UTF-8 encoded Unicode */
 EXTERN int	enc_latin1like INIT(= TRUE);	/* 'encoding' is latin1 comp. */
-# if defined(WIN3264) || defined(FEAT_CYGWIN_WIN32_CLIPBOARD)
+#if defined(WIN3264) || defined(FEAT_CYGWIN_WIN32_CLIPBOARD)
 /* Codepage nr of 'encoding'.  Negative means it's not been set yet, zero
  * means 'encoding' is not a valid codepage. */
 EXTERN int	enc_codepage INIT(= -1);
 EXTERN int	enc_latin9 INIT(= FALSE);	/* 'encoding' is latin9 */
-# endif
+#endif
 EXTERN int	has_mbyte INIT(= 0);		/* any multi-byte encoding */
 
-# if defined(WIN3264) && defined(FEAT_MBYTE)
+#if defined(WIN3264)
 EXTERN int	wide_WindowProc INIT(= FALSE);	/* use wide WindowProc() */
-# endif
+#endif
 
 /*
  * To speed up BYTELEN() we fill a table with the byte lengths whenever
@@ -875,7 +870,6 @@
 EXTERN int* (*iconv_errno) (void);
 # endif
 
-#endif /* FEAT_MBYTE */
 
 #ifdef FEAT_XIM
 # ifdef FEAT_GUI_GTK
diff --git a/src/gui.h b/src/gui.h
index 9ac5e07..a57b0a3 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -303,13 +303,11 @@
     GuiFont	menu_font;	    /* menu item font */
 # endif
 #endif
-#ifdef FEAT_MBYTE
     GuiFont	wide_font;	    /* Normal 'guifontwide' font */
-# ifndef FEAT_GUI_GTK
+#ifndef FEAT_GUI_GTK
     GuiFont	wide_bold_font;	    /* Bold 'guifontwide' font */
     GuiFont	wide_ital_font;	    /* Italic 'guifontwide' font */
     GuiFont	wide_boldital_font; /* Bold-Italic 'guifontwide' font */
-# endif
 #endif
 #ifdef FEAT_XFONTSET
     GuiFontset	fontset;	    /* set of fonts for multi-byte chars */
diff --git a/src/if_py_both.h b/src/if_py_both.h
index 233489e..f15bdc3 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -24,11 +24,7 @@
 typedef int Py_ssize_t;  /* Python 2.4 and earlier don't have this type. */
 #endif
 
-#ifdef FEAT_MBYTE
-# define ENC_OPT ((char *)p_enc)
-#else
-# define ENC_OPT "latin1"
-#endif
+#define ENC_OPT ((char *)p_enc)
 #define DOPY_FUNC "_vim_pydo"
 
 static const char *vim_special_path = "_vim_path_";
@@ -985,11 +981,7 @@
     if (!(str = StringToChars(string, &todecref)))
 	return NULL;
 
-#ifdef FEAT_MBYTE
     len = mb_string2cells(str, (int)STRLEN(str));
-#else
-    len = STRLEN(str);
-#endif
 
     Py_XDECREF(todecref);
 
diff --git a/src/macros.h b/src/macros.h
index e651d2b..ad243cc 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -96,17 +96,10 @@
  * MB_ISLOWER() and MB_ISUPPER() are to be used on multi-byte characters.  But
  * don't use them for negative values!
  */
-#ifdef FEAT_MBYTE
-# define MB_ISLOWER(c)	vim_islower(c)
-# define MB_ISUPPER(c)	vim_isupper(c)
-# define MB_TOLOWER(c)	vim_tolower(c)
-# define MB_TOUPPER(c)	vim_toupper(c)
-#else
-# define MB_ISLOWER(c)	islower(c)
-# define MB_ISUPPER(c)	isupper(c)
-# define MB_TOLOWER(c)	TOLOWER_LOC(c)
-# define MB_TOUPPER(c)	TOUPPER_LOC(c)
-#endif
+#define MB_ISLOWER(c)	vim_islower(c)
+#define MB_ISUPPER(c)	vim_isupper(c)
+#define MB_TOLOWER(c)	vim_tolower(c)
+#define MB_TOUPPER(c)	vim_toupper(c)
 
 /* Use our own isdigit() replacement, because on MS-Windows isdigit() returns
  * non-zero for superscript 1.  Also avoids that isdigit() crashes for numbers
@@ -139,8 +132,7 @@
  * a mapping and the langnoremap option was set.
  * The do-while is just to ignore a ';' after the macro.
  */
-# ifdef FEAT_MBYTE
-#  define LANGMAP_ADJUST(c, condition) \
+# define LANGMAP_ADJUST(c, condition) \
     do { \
 	if (*p_langmap \
 		&& (condition) \
@@ -154,17 +146,6 @@
 		c = langmap_adjust_mb(c); \
 	} \
     } while (0)
-# else
-#  define LANGMAP_ADJUST(c, condition) \
-    do { \
-	if (*p_langmap \
-		&& (condition) \
-		&& (p_lrm || (!p_lrm && KeyTyped)) \
-		&& !KeyStuffed \
-		&& (c) >= 0 && (c) < 256) \
-	    c = langmap_mapchar[c]; \
-    } while (0)
-# endif
 #else
 # define LANGMAP_ADJUST(c, condition) /* nop */
 #endif
@@ -256,33 +237,21 @@
  * MB_COPY_CHAR(f, t): copy one char from "f" to "t" and advance the pointers.
  * PTR2CHAR(): get character from pointer.
  */
-#ifdef FEAT_MBYTE
 /* Get the length of the character p points to, including composing chars */
-# define MB_PTR2LEN(p)	    (has_mbyte ? (*mb_ptr2len)(p) : 1)
+#define MB_PTR2LEN(p)	    (has_mbyte ? (*mb_ptr2len)(p) : 1)
 /* Advance multi-byte pointer, skip over composing chars. */
-# define MB_PTR_ADV(p)	    p += has_mbyte ? (*mb_ptr2len)(p) : 1
+#define MB_PTR_ADV(p)	    p += has_mbyte ? (*mb_ptr2len)(p) : 1
 /* Advance multi-byte pointer, do not skip over composing chars. */
-# define MB_CPTR_ADV(p)	    p += enc_utf8 ? utf_ptr2len(p) : has_mbyte ? (*mb_ptr2len)(p) : 1
+#define MB_CPTR_ADV(p)	    p += enc_utf8 ? utf_ptr2len(p) : has_mbyte ? (*mb_ptr2len)(p) : 1
 /* Backup multi-byte pointer. Only use with "p" > "s" ! */
-# define MB_PTR_BACK(s, p)  p -= has_mbyte ? ((*mb_head_off)(s, p - 1) + 1) : 1
+#define MB_PTR_BACK(s, p)  p -= has_mbyte ? ((*mb_head_off)(s, p - 1) + 1) : 1
 /* get length of multi-byte char, not including composing chars */
-# define MB_CPTR2LEN(p)	    (enc_utf8 ? utf_ptr2len(p) : (*mb_ptr2len)(p))
+#define MB_CPTR2LEN(p)	    (enc_utf8 ? utf_ptr2len(p) : (*mb_ptr2len)(p))
 
-# define MB_COPY_CHAR(f, t) if (has_mbyte) mb_copy_char(&f, &t); else *t++ = *f++
-# define MB_CHARLEN(p)	    (has_mbyte ? mb_charlen(p) : (int)STRLEN(p))
-# define MB_CHAR2LEN(c)	    (has_mbyte ? mb_char2len(c) : 1)
-# define PTR2CHAR(p)	    (has_mbyte ? mb_ptr2char(p) : (int)*(p))
-#else
-# define MB_PTR2LEN(p)		1
-# define MB_CPTR2LEN(p)		1
-# define MB_PTR_ADV(p)		++p
-# define MB_CPTR_ADV(p)		++p
-# define MB_PTR_BACK(s, p)	--p
-# define MB_COPY_CHAR(f, t)	*t++ = *f++
-# define MB_CHARLEN(p)		STRLEN(p)
-# define MB_CHAR2LEN(c)		1
-# define PTR2CHAR(p)		((int)*(p))
-#endif
+#define MB_COPY_CHAR(f, t) if (has_mbyte) mb_copy_char(&f, &t); else *t++ = *f++
+#define MB_CHARLEN(p)	    (has_mbyte ? mb_charlen(p) : (int)STRLEN(p))
+#define MB_CHAR2LEN(c)	    (has_mbyte ? mb_char2len(c) : 1)
+#define PTR2CHAR(p)	    (has_mbyte ? mb_ptr2char(p) : (int)*(p))
 
 #ifdef FEAT_AUTOCHDIR
 # define DO_AUTOCHDIR do { if (p_acd) do_autochdir(); } while (0)
diff --git a/src/option.h b/src/option.h
index 50fe380..d648df7 100644
--- a/src/option.h
+++ b/src/option.h
@@ -69,13 +69,11 @@
 #endif
 
 
-#ifdef FEAT_MBYTE
 /* Possible values for 'encoding' */
-# define ENC_UCSBOM	"ucs-bom"	/* check for BOM at start of file */
+#define ENC_UCSBOM	"ucs-bom"	/* check for BOM at start of file */
 
 /* default value for 'encoding' */
-# define ENC_DFLT	"latin1"
-#endif
+#define ENC_DFLT	"latin1"
 
 /* end-of-line style */
 #define EOL_UNKNOWN	-1	/* not defined yet */
@@ -315,10 +313,8 @@
 #ifdef FEAT_AUTOCHDIR
 EXTERN int	p_acd;		/* 'autochdir' */
 #endif
-#ifdef FEAT_MBYTE
 EXTERN char_u	*p_ambw;	/* 'ambiwidth' */
 EXTERN char_u	*p_emoji;	/* 'emoji' */
-#endif
 #if defined(FEAT_GUI) && defined(MACOS_X)
 EXTERN int	*p_antialias;	/* 'antialias' */
 #endif
@@ -395,21 +391,17 @@
 #ifdef FEAT_LINEBREAK
 EXTERN char_u	*p_breakat;	/* 'breakat' */
 #endif
-#ifdef FEAT_MBYTE
 EXTERN char_u	*p_cmp;		/* 'casemap' */
 EXTERN unsigned	cmp_flags;
-# ifdef IN_OPTION_C
+#ifdef IN_OPTION_C
 static char *(p_cmp_values[]) = {"internal", "keepascii", NULL};
-# endif
-# define CMP_INTERNAL		0x001
-# define CMP_KEEPASCII		0x002
 #endif
-#ifdef FEAT_MBYTE
+#define CMP_INTERNAL		0x001
+#define CMP_KEEPASCII		0x002
 EXTERN char_u	*p_enc;		/* 'encoding' */
 EXTERN int	p_deco;		/* 'delcombine' */
-# ifdef FEAT_EVAL
+#ifdef FEAT_EVAL
 EXTERN char_u	*p_ccv;		/* 'charconvert' */
-# endif
 #endif
 #ifdef FEAT_CMDWIN
 EXTERN char_u	*p_cedit;	/* 'cedit' */
@@ -482,9 +474,7 @@
 EXTERN char_u	*p_ei;		/* 'eventignore' */
 EXTERN int	p_ek;		/* 'esckeys' */
 EXTERN int	p_exrc;		/* 'exrc' */
-#ifdef FEAT_MBYTE
 EXTERN char_u	*p_fencs;	/* 'fileencodings' */
-#endif
 EXTERN char_u	*p_ffs;		/* 'fileformats' */
 EXTERN long	p_fic;		/* 'fileignorecase' */
 #ifdef FEAT_FOLDING
@@ -519,10 +509,8 @@
 # ifdef FEAT_POSTSCRIPT
 EXTERN char_u	*p_penc;	/* 'printencoding' */
 EXTERN char_u	*p_pexpr;	/* 'printexpr' */
-#   ifdef FEAT_MBYTE
 EXTERN char_u	*p_pmfn;	/* 'printmbfont' */
 EXTERN char_u	*p_pmcs;	/* 'printmbcharset' */
-#   endif
 # endif
 EXTERN char_u	*p_pfn;		/* 'printfont' */
 EXTERN char_u	*p_popt;	/* 'printoptions' */
@@ -534,9 +522,7 @@
 # ifdef FEAT_XFONTSET
 EXTERN char_u	*p_guifontset;	/* 'guifontset' */
 # endif
-# ifdef FEAT_MBYTE
 EXTERN char_u	*p_guifontwide;	/* 'guifontwide' */
-# endif
 EXTERN int	p_guipty;	/* 'guipty' */
 #endif
 #if defined(FEAT_GUI_GTK) || defined(FEAT_GUI_X11)
@@ -586,14 +572,12 @@
 #define IM_OVER_THE_SPOT	1L
 EXTERN long	p_imst;		/* 'imstyle' */
 #endif
-#if defined(FEAT_EVAL) && defined(FEAT_MBYTE)
+#if defined(FEAT_EVAL)
 EXTERN char_u	*p_imaf;	/* 'imactivatefunc' */
 EXTERN char_u	*p_imsf;	/* 'imstatusfunc' */
 #endif
-#ifdef FEAT_MBYTE
 EXTERN int	p_imcmdline;	/* 'imcmdline' */
 EXTERN int	p_imdisable;	/* 'imdisable' */
-#endif
 EXTERN int	p_is;		/* 'incsearch' */
 EXTERN int	p_im;		/* 'insertmode' */
 EXTERN char_u	*p_isf;		/* 'isfname' */
@@ -629,9 +613,7 @@
 EXTERN int	p_macatsui;	/* 'macatsui' */
 #endif
 EXTERN int	p_magic;	/* 'magic' */
-#ifdef FEAT_MBYTE
 EXTERN char_u	*p_menc;	/* 'makeencoding' */
-#endif
 #ifdef FEAT_QUICKFIX
 EXTERN char_u	*p_mef;		/* 'makeef' */
 EXTERN char_u	*p_mp;		/* 'makeprg' */
@@ -644,9 +626,7 @@
 EXTERN int      p_cc_cols[256]; /* array for 'colorcolumn' columns */
 #endif
 EXTERN long	p_mat;		/* 'matchtime' */
-#ifdef FEAT_MBYTE
 EXTERN long	p_mco;		/* 'maxcombine' */
-#endif
 #ifdef FEAT_EVAL
 EXTERN long	p_mfd;		/* 'maxfuncdepth' */
 #endif
@@ -850,9 +830,7 @@
 #ifdef FEAT_ARABIC
 EXTERN int	p_tbidi;	/* 'termbidi' */
 #endif
-#ifdef FEAT_MBYTE
 EXTERN char_u	*p_tenc;	/* 'termencoding' */
-#endif
 #ifdef FEAT_TERMGUICOLORS
 EXTERN int	p_tgc;		/* 'termguicolors' */
 #endif
@@ -1001,9 +979,7 @@
 #endif
     , BV_BIN
     , BV_BL
-#ifdef FEAT_MBYTE
     , BV_BOMB
-#endif
     , BV_CI
 #ifdef FEAT_CINDENT
     , BV_CIN
@@ -1068,9 +1044,7 @@
     , BV_LISP
     , BV_LW
 #endif
-#ifdef FEAT_MBYTE
     , BV_MENC
-#endif
     , BV_MA
     , BV_ML
     , BV_MOD
diff --git a/src/os_mac.h b/src/os_mac.h
index c858a62..692e253 100644
--- a/src/os_mac.h
+++ b/src/os_mac.h
@@ -37,9 +37,7 @@
 # include <Memory.h>
 # include <OSUtils.h>
 # include <Files.h>
-# ifdef FEAT_MBYTE
-#  include <Script.h>
-# endif
+# include <Script.h>
 #endif
 
 /*
diff --git a/src/os_win32.h b/src/os_win32.h
index 37f6106..6c4a349 100644
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -213,14 +213,7 @@
 #endif
 
 /* Enable common dialogs input unicode from IME if possible. */
-#ifdef FEAT_MBYTE
-# define pDispatchMessage DispatchMessageW
-# define pGetMessage GetMessageW
-# define pIsDialogMessage IsDialogMessageW
-# define pPeekMessage PeekMessageW
-#else
-# define pDispatchMessage DispatchMessage
-# define pGetMessage GetMessage
-# define pIsDialogMessage IsDialogMessage
-# define pPeekMessage PeekMessage
-#endif
+#define pDispatchMessage DispatchMessageW
+#define pGetMessage GetMessageW
+#define pIsDialogMessage IsDialogMessageW
+#define pPeekMessage PeekMessageW
diff --git a/src/proto.h b/src/proto.h
index a71b632..cb4add0 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -168,10 +168,7 @@
 void qsort(void *base, size_t elm_count, size_t elm_size, int (*cmp)(const void *, const void *));
 #endif
 # include "move.pro"
-# if defined(FEAT_MBYTE) || defined(FEAT_XIM) || defined(FEAT_KEYMAP) \
-	|| defined(FEAT_POSTSCRIPT)
-#  include "mbyte.pro"
-# endif
+# include "mbyte.pro"
 # include "normal.pro"
 # include "ops.pro"
 # include "option.pro"
diff --git a/src/search.c b/src/search.c
index 94b1ef1..0c2ce95 100644
--- a/src/search.c
+++ b/src/search.c
@@ -85,10 +85,8 @@
 static char_u lastc[2] = {NUL, NUL};	/* last character searched for */
 static int lastcdir = FORWARD;		/* last direction of character search */
 static int last_t_cmd = TRUE;		/* last search t_cmd */
-#ifdef FEAT_MBYTE
 static char_u	lastc_bytes[MB_MAXBYTES + 1];
 static int	lastc_bytelen = 1;	/* >1 for multi-byte char */
-#endif
 
 /* copy of spats[], for keeping the search patterns while executing autocmds */
 static struct spat  saved_spats[2];
@@ -248,7 +246,6 @@
 	rev_i = len;
 	for (s_i = 0; s_i < len; ++s_i)
 	{
-# ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		int	mb_len;
@@ -259,7 +256,6 @@
 		s_i += mb_len - 1;
 	    }
 	    else
-# endif
 		rev[--rev_i] = s[s_i];
 
 	}
@@ -446,7 +442,6 @@
 
     while (*p != NUL)
     {
-#ifdef FEAT_MBYTE
 	int		l;
 
 	if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
@@ -455,9 +450,7 @@
 		return TRUE;
 	    p += l;
 	}
-	else
-#endif
-	     if (*p == '\\')
+	else if (*p == '\\')
 	{
 	    if (p[1] == '_' && p[2] != NUL)  /* skip "\_X" */
 		p += 3;
@@ -480,11 +473,7 @@
     char_u *
 last_csearch(void)
 {
-#ifdef FEAT_MBYTE
     return lastc_bytes;
-#else
-    return lastc;
-#endif
 }
 
     int
@@ -503,13 +492,11 @@
 set_last_csearch(int c, char_u *s UNUSED, int len UNUSED)
 {
     *lastc = c;
-#ifdef FEAT_MBYTE
     lastc_bytelen = len;
     if (len)
 	memcpy(lastc_bytes, s, len);
     else
 	vim_memset(lastc_bytes, 0, sizeof(lastc_bytes));
-#endif
 }
 #endif
 
@@ -687,7 +674,6 @@
 	 * MAXCOL + 1 is zero. */
 	if (pos->col == MAXCOL)
 	    start_char_len = 0;
-#ifdef FEAT_MBYTE
 	/* Watch out for the "col" being MAXCOL - 2, used in a closed fold. */
 	else if (has_mbyte
 		    && pos->lnum >= 1 && pos->lnum <= buf->b_ml.ml_line_count
@@ -699,7 +685,6 @@
 	    else
 		start_char_len = (*mb_ptr2len)(ptr + pos->col);
 	}
-#endif
 	else
 	    start_char_len = 1;
 	if (dir == FORWARD)
@@ -835,12 +820,10 @@
 				if (matchcol == matchpos.col
 						      && ptr[matchcol] != NUL)
 				{
-#ifdef FEAT_MBYTE
 				    if (has_mbyte)
 					matchcol +=
 					  (*mb_ptr2len)(ptr + matchcol);
 				    else
-#endif
 					++matchcol;
 				}
 			    }
@@ -849,12 +832,10 @@
 				matchcol = matchpos.col;
 				if (ptr[matchcol] != NUL)
 				{
-#ifdef FEAT_MBYTE
 				    if (has_mbyte)
 					matchcol += (*mb_ptr2len)(ptr
 								  + matchcol);
 				    else
-#endif
 					++matchcol;
 				}
 			    }
@@ -946,12 +927,10 @@
 				if (matchcol == matchpos.col
 						      && ptr[matchcol] != NUL)
 				{
-#ifdef FEAT_MBYTE
 				    if (has_mbyte)
 					matchcol +=
 					  (*mb_ptr2len)(ptr + matchcol);
 				    else
-#endif
 					++matchcol;
 				}
 			    }
@@ -963,12 +942,10 @@
 				matchcol = matchpos.col;
 				if (ptr[matchcol] != NUL)
 				{
-#ifdef FEAT_MBYTE
 				    if (has_mbyte)
 					matchcol +=
 					  (*mb_ptr2len)(ptr + matchcol);
 				    else
-#endif
 					++matchcol;
 				}
 			    }
@@ -1029,14 +1006,12 @@
 			else
 			{
 			    --pos->col;
-#ifdef FEAT_MBYTE
 			    if (has_mbyte
 				    && pos->lnum <= buf->b_ml.ml_line_count)
 			    {
 				ptr = ml_get_buf(buf, pos->lnum, FALSE);
 				pos->col -= (*mb_head_off)(ptr, ptr + pos->col);
 			    }
-#endif
 			}
 			if (end_pos != NULL)
 			{
@@ -1410,7 +1385,6 @@
 	    if (msgbuf != NULL)
 	    {
 		msgbuf[0] = dirc;
-#ifdef FEAT_MBYTE
 		if (enc_utf8 && utf_iscomposing(utf_ptr2char(p)))
 		{
 		    /* Use a space to draw the composing char on. */
@@ -1418,7 +1392,6 @@
 		    STRCPY(msgbuf + 2, p);
 		}
 		else
-#endif
 		    STRCPY(msgbuf + 1, p);
 		if (spats[0].off.line || spats[0].off.end || spats[0].off.off)
 		{
@@ -1711,7 +1684,6 @@
 	    *lastc = c;
 	    set_csearch_direction(dir);
 	    set_csearch_until(t_cmd);
-#ifdef FEAT_MBYTE
 	    lastc_bytelen = (*mb_char2bytes)(c, lastc_bytes);
 	    if (cap->ncharC1 != 0)
 	    {
@@ -1721,16 +1693,11 @@
 		    lastc_bytelen += (*mb_char2bytes)(cap->ncharC2,
 			    lastc_bytes + lastc_bytelen);
 	    }
-#endif
 	}
     }
     else		/* repeat previous search */
     {
-	if (*lastc == NUL
-#ifdef FEAT_MBYTE
-		&& lastc_bytelen == 1
-#endif
-		)
+	if (*lastc == NUL && lastc_bytelen == 1)
 	    return FAIL;
 	if (dir)	/* repeat in opposite direction */
 	    dir = -lastcdir;
@@ -1758,7 +1725,6 @@
 
     while (count--)
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    for (;;)
@@ -1787,7 +1753,6 @@
 	    }
 	}
 	else
-#endif
 	{
 	    for (;;)
 	    {
@@ -1804,7 +1769,6 @@
     {
 	/* backup to before the character (possibly double-byte) */
 	col -= dir;
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    if (dir < 0)
@@ -1814,7 +1778,6 @@
 		/* To previous char, which may be multi-byte. */
 		col -= (*mb_head_off)(p, p + col);
 	}
-#endif
     }
     curwin->w_cursor.col = col;
 
@@ -1851,10 +1814,8 @@
     int		*prevcol)
 {
     --col;
-#ifdef FEAT_MBYTE
     if (col > 0 && has_mbyte)
 	col -= (*mb_head_off)(linep, linep + col);
-#endif
     if (prevcol)
 	*prevcol = col;
     return (col >= 0 && linep[col] == ch) ? TRUE : FALSE;
@@ -2237,10 +2198,8 @@
 	    else
 	    {
 		--pos.col;
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		    pos.col -= (*mb_head_off)(linep, linep + pos.col);
-#endif
 	    }
 	}
 	else				/* forward search */
@@ -2278,11 +2237,9 @@
 	    }
 	    else
 	    {
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		    pos.col += (*mb_ptr2len)(linep + pos.col);
 		else
-#endif
 		    ++pos.col;
 	    }
 	}
@@ -2934,10 +2891,8 @@
 	if ((curwin->w_cursor.col = (colnr_T)STRLEN(line)) != 0)
 	{
 	    --curwin->w_cursor.col;
-#ifdef FEAT_MBYTE
 	    curwin->w_cursor.col -=
 			     (*mb_head_off)(line, line + curwin->w_cursor.col);
-#endif
 	    *pincl = TRUE;
 	}
     }
@@ -3029,7 +2984,6 @@
 #endif
     if (c == ' ' || c == '\t' || c == NUL)
 	return 0;
-#ifdef FEAT_MBYTE
     if (enc_dbcs != 0 && c > 0xFF)
     {
 	/* If cls_bigword, report multi-byte chars as class 1. */
@@ -3046,7 +3000,6 @@
 	    return 1;
 	return c;
     }
-#endif
 
     /* If cls_bigword is TRUE, report all non-blanks as class 1. */
     if (cls_bigword)
@@ -3903,7 +3856,6 @@
     int		lc = NUL;
     pos_T	pos;
 
-#ifdef FEAT_MBYTE
     if (enc_dbcs)
     {
 	char_u	*lp = NULL;
@@ -3924,7 +3876,6 @@
 	}
     }
     else
-#endif
     {
 	for (p = line + curwin->w_cursor.col; p > line; )
 	{
@@ -4371,11 +4322,9 @@
 	    ++col;
 	else if (c == quotechar)
 	    break;
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    col += (*mb_ptr2len)(line + col);
 	else
-#endif
 	    ++col;
     }
     return col;
@@ -4399,9 +4348,7 @@
     while (col_start > 0)
     {
 	--col_start;
-#ifdef FEAT_MBYTE
 	col_start -= (*mb_head_off)(line, line + col_start);
-#endif
 	n = 0;
 	if (escape != NULL)
 	    while (col_start - n > 0 && vim_strchr(escape,
diff --git a/src/sign.c b/src/sign.c
index 3e2baff..44b638c 100644
--- a/src/sign.c
+++ b/src/sign.c
@@ -820,7 +820,6 @@
 	}
 
     // Count cells and check for non-printable chars
-# ifdef FEAT_MBYTE
     if (has_mbyte)
     {
 	cells = 0;
@@ -832,7 +831,6 @@
 	}
     }
     else
-# endif
     {
 	for (s = text; s < endp; ++s)
 	    if (!vim_isprintc(*s))
diff --git a/src/spell.c b/src/spell.c
index 8d0eddc..59e7368 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -224,12 +224,8 @@
 					   affixID/condition */
     int		mi_prefcnt;		/* number of entries at mi_prefarridx */
     int		mi_prefixlen;		/* byte length of prefix */
-#ifdef FEAT_MBYTE
     int		mi_cprefixlen;		/* byte length of prefix in original
 					   case */
-#else
-# define mi_cprefixlen mi_prefixlen	/* it's the same value */
-#endif
 
     /* for when checking a compound word */
     int		mi_compoff;		/* start of following word offset */
@@ -249,9 +245,7 @@
 
 
 static int spell_iswordp(char_u *p, win_T *wp);
-#ifdef FEAT_MBYTE
 static int spell_mb_isword_class(int cl, win_T *wp);
-#endif
 
 /*
  * For finding suggestions: At each node in the tree these states are tried:
@@ -295,12 +289,10 @@
     char_u	ts_prefixdepth;	/* stack depth for end of prefix or
 				 * PFD_PREFIXTREE or PFD_NOPREFIX */
     char_u	ts_flags;	/* TSF_ flags */
-#ifdef FEAT_MBYTE
     char_u	ts_tcharlen;	/* number of bytes in tword character */
     char_u	ts_tcharidx;	/* current byte index in tword character */
     char_u	ts_isdiff;	/* DIFF_ values */
     char_u	ts_fcharstart;	/* index in fword where badword char started */
-#endif
     char_u	ts_prewordlen;	/* length of word in "preword[]" */
     char_u	ts_splitoff;	/* index in "tword" after last split */
     char_u	ts_splitfidx;	/* "ts_fidx" at word split */
@@ -358,9 +350,7 @@
 static void suggest_try_change(suginfo_T *su);
 static void suggest_trie_walk(suginfo_T *su, langp_T *lp, char_u *fword, int soundfold);
 static void go_deeper(trystate_T *stack, int depth, int score_add);
-#ifdef FEAT_MBYTE
 static int nofold_len(char_u *fword, int flen, char_u *word);
-#endif
 static void find_keepcap_word(slang_T *slang, char_u *fword, char_u *kword);
 static void score_comp_sal(suginfo_T *su);
 static void score_combine(suginfo_T *su);
@@ -380,15 +370,11 @@
 static int cleanup_suggestions(garray_T *gap, int maxscore, int keep);
 static void spell_soundfold_sofo(slang_T *slang, char_u *inword, char_u *res);
 static void spell_soundfold_sal(slang_T *slang, char_u *inword, char_u *res);
-#ifdef FEAT_MBYTE
 static void spell_soundfold_wsal(slang_T *slang, char_u *inword, char_u *res);
-#endif
 static int soundalike_score(char_u *goodsound, char_u *badsound);
 static int spell_edit_score(slang_T *slang, char_u *badword, char_u *goodword);
 static int spell_edit_score_limit(slang_T *slang, char_u *badword, char_u *goodword, int limit);
-#ifdef FEAT_MBYTE
 static int spell_edit_score_limit_w(slang_T *slang, char_u *badword, char_u *goodword, int limit);
-#endif
 static void dump_word(slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T lnum);
 static linenr_T dump_prefixes(slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T startlnum);
 
@@ -565,10 +551,8 @@
 		    *capcol = (int)(regmatch.endp[0] - ptr);
 	    }
 
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 		return (*mb_ptr2len)(ptr);
-#endif
 	    return 1;
 	}
 	else if (mi.mi_end == ptr)
@@ -646,9 +630,7 @@
     int		c;
     char_u	*ptr;
     idx_T	lo, hi, m;
-#ifdef FEAT_MBYTE
     char_u	*s;
-#endif
     char_u	*p;
     int		res = SP_BAD;
     slang_T	*slang = mip->mi_lp->lp_slang;
@@ -794,10 +776,8 @@
 	arridx = endidx[endidxcnt];
 	wlen = endlen[endidxcnt];
 
-#ifdef FEAT_MBYTE
 	if ((*mb_head_off)(ptr, ptr + wlen) > 0)
 	    continue;	    /* not at first byte of character */
-#endif
 	if (spell_iswordp(ptr + wlen, mip->mi_win))
 	{
 	    if (slang->sl_compprog == NULL && !slang->sl_nobreak)
@@ -810,7 +790,6 @@
 	 * has been found we try compound flags. */
 	prefix_found = FALSE;
 
-#ifdef FEAT_MBYTE
 	if (mode != FIND_KEEPWORD && has_mbyte)
 	{
 	    /* Compute byte length in original word, length may change
@@ -824,7 +803,6 @@
 		wlen = (int)(p - mip->mi_word);
 	    }
 	}
-#endif
 
 	/* Check flags and region.  For FIND_PREFIX check the condition and
 	 * prefix ID.
@@ -896,7 +874,6 @@
 		if (((unsigned)flags >> 24) == 0
 			     || wlen - mip->mi_compoff < slang->sl_compminlen)
 		    continue;
-#ifdef FEAT_MBYTE
 		/* For multi-byte chars check character length against
 		 * COMPOUNDMIN. */
 		if (has_mbyte
@@ -904,7 +881,6 @@
 			&& mb_charlen_len(mip->mi_word + mip->mi_compoff,
 				wlen - mip->mi_compoff) < slang->sl_compminlen)
 			continue;
-#endif
 
 		/* Limit the number of compound words to COMPOUNDWORDMAX if no
 		 * maximum for syllables is specified. */
@@ -938,7 +914,6 @@
 
 		    /* Need to check the caps type of the appended compound
 		     * word. */
-#ifdef FEAT_MBYTE
 		    if (has_mbyte && STRNCMP(ptr, mip->mi_word,
 							mip->mi_compoff) != 0)
 		    {
@@ -948,7 +923,6 @@
 			    MB_PTR_ADV(p);
 		    }
 		    else
-#endif
 			p = mip->mi_word + mip->mi_compoff;
 		    capflags = captype(p, mip->mi_word + wlen);
 		    if (capflags == WF_KEEPCAP || (capflags == WF_ALLCAP
@@ -1020,7 +994,6 @@
 
 		/* Find following word in case-folded tree. */
 		mip->mi_compoff = endlen[endidxcnt];
-#ifdef FEAT_MBYTE
 		if (has_mbyte && mode == FIND_KEEPWORD)
 		{
 		    /* Compute byte length in case-folded word from "wlen":
@@ -1035,7 +1008,6 @@
 			mip->mi_compoff = (int)(p - mip->mi_fword);
 		    }
 		}
-#endif
 #if 0 /* Disabled, see below */
 		c = mip->mi_compoff;
 #endif
@@ -1186,15 +1158,12 @@
     static int
 can_compound(slang_T *slang, char_u *word, char_u *flags)
 {
-#ifdef FEAT_MBYTE
     char_u	uflags[MAXWLEN * 2];
     int		i;
-#endif
     char_u	*p;
 
     if (slang->sl_compprog == NULL)
 	return FALSE;
-#ifdef FEAT_MBYTE
     if (enc_utf8)
     {
 	/* Need to convert the single byte flags to utf8 characters. */
@@ -1205,7 +1174,6 @@
 	p = uflags;
     }
     else
-#endif
 	p = flags;
     if (!vim_regexec_prog(&slang->sl_compprog, FALSE, p, 0))
 	return FALSE;
@@ -1434,7 +1402,6 @@
 		/* Skip over the previously found word(s). */
 		mip->mi_prefixlen += mip->mi_compoff;
 
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		/* Case-folded length may differ from original length. */
@@ -1443,7 +1410,6 @@
 	    }
 	    else
 		mip->mi_cprefixlen = mip->mi_prefixlen;
-#endif
 	    find_word(mip, FIND_PREFIX);
 
 
@@ -1912,10 +1878,8 @@
 spell_enc(void)
 {
 
-#ifdef FEAT_MBYTE
     if (STRLEN(p_enc) < 60 && STRCMP(p_enc, "iso-8859-15") != 0)
 	return p_enc;
-#endif
     return (char_u *)"latin1";
 }
 
@@ -2015,11 +1979,9 @@
 	    vim_free(smp->sm_lead);
 	    /* Don't free sm_oneof and sm_rules, they point into sm_lead. */
 	    vim_free(smp->sm_to);
-#ifdef FEAT_MBYTE
 	    vim_free(smp->sm_lead_w);
 	    vim_free(smp->sm_oneof_w);
 	    vim_free(smp->sm_to_w);
-#endif
 	}
     ga_clear(gap);
 
@@ -2046,9 +2008,7 @@
     hash_clear_all(&lp->sl_wordcount, WC_KEY_OFF);
     hash_init(&lp->sl_wordcount);
 
-#ifdef FEAT_MBYTE
     hash_clear_all(&lp->sl_map_hash, 0);
-#endif
 
     /* Clear info from .sug file. */
     slang_clear_sug(lp);
@@ -2284,13 +2244,8 @@
 	else
 	{
 	    /* No recognized syllable item, at least a syllable char then? */
-#ifdef FEAT_MBYTE
 	    c = mb_ptr2char(p);
 	    len = (*mb_ptr2len)(p);
-#else
-	    c = *p;
-	    len = 1;
-#endif
 	    if (vim_strchr(slang->sl_syllable, c) == NULL)
 		skip = FALSE;	    /* No, search for next syllable */
 	    else if (!skip)
@@ -2352,9 +2307,7 @@
     if (spl_copy == NULL)
 	goto theend;
 
-#ifdef FEAT_MBYTE
     wp->w_s->b_cjk = 0;
-#endif
 
     /* Loop over comma separated language names. */
     for (splp = spl_copy; *splp != NUL; )
@@ -2366,9 +2319,7 @@
 
 	if (STRCMP(lang, "cjk") == 0)
 	{
-#ifdef FEAT_MBYTE
 	    wp->w_s->b_cjk = 1;
-#endif
 	    continue;
 	}
 
@@ -2633,9 +2584,7 @@
 clear_midword(win_T *wp)
 {
     vim_memset(wp->w_s->b_spell_ismw, 0, 256);
-#ifdef FEAT_MBYTE
     VIM_CLEAR(wp->w_s->b_spell_ismw_mb);
-#endif
 }
 
 /*
@@ -2651,7 +2600,6 @@
 	return;
 
     for (p = lp->sl_midword; *p != NUL; )
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    int	    c, l, n;
@@ -2679,7 +2627,6 @@
 	    p += l;
 	}
 	else
-#endif
 	    wp->w_s->b_spell_ismw[*p++] = TRUE;
 }
 
@@ -2725,11 +2672,9 @@
     for (p = word; !spell_iswordp_nmw(p, curwin); MB_PTR_ADV(p))
 	if (end == NULL ? *p == NUL : p >= end)
 	    return 0;	    /* only non-word characters, illegal word */
-#ifdef FEAT_MBYTE
     if (has_mbyte)
 	c = mb_ptr2char_adv(&p);
     else
-#endif
 	c = *p++;
     firstcap = allcap = SPELL_ISUPPER(c);
 
@@ -2825,7 +2770,6 @@
     }
 }
 
-#if defined(FEAT_MBYTE) || defined(EXITFREE) || defined(PROTO)
 /*
  * Free all languages.
  */
@@ -2851,9 +2795,7 @@
     VIM_CLEAR(repl_to);
     VIM_CLEAR(repl_from);
 }
-#endif
 
-#if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Clear all spelling tables and reload them.
  * Used after 'encoding' is set and when ":mkspell" was used.
@@ -2884,7 +2826,6 @@
 	}
     }
 }
-#endif
 
 /*
  * Opposite of offset2bytes().
@@ -3016,7 +2957,6 @@
 
     did_set_spelltab = FALSE;
     clear_spell_chartab(&spelltab);
-#ifdef FEAT_MBYTE
     if (enc_dbcs)
     {
 	/* DBCS: assume double-wide characters are word characters. */
@@ -3041,7 +2981,6 @@
 	}
     }
     else
-#endif
     {
 	/* Rough guess: use locale-dependent library functions. */
 	for (i = 128; i < 256; ++i)
@@ -3073,7 +3012,6 @@
     char_u	*p,
     win_T	*wp)	    /* buffer used */
 {
-#ifdef FEAT_MBYTE
     char_u	*s;
     int		l;
     int		c;
@@ -3102,7 +3040,6 @@
 	    return spell_mb_isword_class(mb_get_class(s), wp);
 	return spelltab.st_isw[c];
     }
-#endif
 
     return spelltab.st_isw[wp->w_s->b_spell_ismw[*p] ? p[1] : p[0]];
 }
@@ -3114,7 +3051,6 @@
     int
 spell_iswordp_nmw(char_u *p, win_T *wp)
 {
-#ifdef FEAT_MBYTE
     int		c;
 
     if (has_mbyte)
@@ -3124,11 +3060,9 @@
 	    return spell_mb_isword_class(mb_get_class(p), wp);
 	return spelltab.st_isw[c];
     }
-#endif
     return spelltab.st_isw[*p];
 }
 
-#ifdef FEAT_MBYTE
 /*
  * Return TRUE if word class indicates a word character.
  * Only for characters above 255.
@@ -3171,7 +3105,6 @@
     }
     return spelltab.st_isw[*s];
 }
-#endif
 
 /*
  * Case-fold "str[len]" into "buf[buflen]".  The result is NUL terminated.
@@ -3194,7 +3127,6 @@
 	return FAIL;		/* result will not fit */
     }
 
-#ifdef FEAT_MBYTE
     if (has_mbyte)
     {
 	int	outi = 0;
@@ -3215,7 +3147,6 @@
 	buf[outi] = NUL;
     }
     else
-#endif
     {
 	/* Be quick for non-multibyte encodings. */
 	for (i = 0; i < len; ++i)
@@ -4072,21 +4003,17 @@
     int		l;
 
     p = word;
-#ifdef FEAT_MBYTE
     if (has_mbyte)
 	c = mb_cptr2char_adv(&p);
     else
-#endif
 	c = *p++;
     if (upper)
 	c = SPELL_TOUPPER(c);
     else
 	c = SPELL_TOFOLD(c);
-#ifdef FEAT_MBYTE
     if (has_mbyte)
 	l = mb_char2bytes(c, wcopy);
     else
-#endif
     {
 	l = 1;
 	wcopy[0] = c;
@@ -4108,14 +4035,11 @@
     d = wcopy;
     for (s = word; *s != NUL; )
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    c = mb_cptr2char_adv(&s);
 	else
-#endif
 	    c = *s++;
 
-#ifdef FEAT_MBYTE
 	/* We only change 0xdf to SS when we are certain latin1 is used.  It
 	 * would cause weird errors in other 8-bit encodings. */
 	if (enc_latin1like && c == 0xdf)
@@ -4126,10 +4050,8 @@
 	    *d++ = c;
 	}
 	else
-#endif
 	    c = SPELL_TOUPPER(c);
 
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    if (d - wcopy >= MAXWLEN - MB_MAXBYTES)
@@ -4137,7 +4059,6 @@
 	    d += mb_char2bytes(c, d);
 	}
 	else
-#endif
 	{
 	    if (d - wcopy >= MAXWLEN - 1)
 		break;
@@ -4434,11 +4355,9 @@
 		{
 		    /* Set su->su_badflags to the caps type at this position.
 		     * Use the caps type until here for the prefix itself. */
-#ifdef FEAT_MBYTE
 		    if (has_mbyte)
 			n = nofold_len(fword, sp->ts_fidx, su->su_badptr);
 		    else
-#endif
 			n = sp->ts_fidx;
 		    flags = badword_captype(su->su_badptr, su->su_badptr + n);
 		    su->su_badflags = badword_captype(su->su_badptr + n,
@@ -4568,7 +4487,6 @@
 			    || sp->ts_twordlen - sp->ts_splitoff
 						       < slang->sl_compminlen)
 			break;
-#ifdef FEAT_MBYTE
 		    /* For multi-byte chars check character length against
 		     * COMPOUNDMIN. */
 		    if (has_mbyte
@@ -4576,7 +4494,6 @@
 			    && mb_charlen(tword + sp->ts_splitoff)
 						       < slang->sl_compminlen)
 			break;
-#endif
 
 		    compflags[sp->ts_complen] = ((unsigned)flags >> 24);
 		    compflags[sp->ts_complen + 1] = NUL;
@@ -4625,12 +4542,7 @@
 		 * allcap and it's only one char long use onecap. */
 		c = su->su_badflags;
 		if ((c & WF_ALLCAP)
-#ifdef FEAT_MBYTE
-			&& su->su_badlen == (*mb_ptr2len)(su->su_badptr)
-#else
-			&& su->su_badlen == 1
-#endif
-			)
+			&& su->su_badlen == (*mb_ptr2len)(su->su_badptr))
 		    c = WF_ONECAP;
 		c |= flags;
 
@@ -4752,11 +4664,8 @@
 	     * Try word split and/or compounding.
 	     */
 	    if ((sp->ts_fidx >= sp->ts_fidxtry || fword_ends)
-#ifdef FEAT_MBYTE
 		    /* Don't split halfway a character. */
-		    && (!has_mbyte || sp->ts_tcharlen == 0)
-#endif
-		    )
+		    && (!has_mbyte || sp->ts_tcharlen == 0))
 	    {
 		int	try_compound;
 		int	try_split;
@@ -4789,12 +4698,10 @@
 			&& ((unsigned)flags >> 24) != 0
 			&& sp->ts_twordlen - sp->ts_splitoff
 						       >= slang->sl_compminlen
-#ifdef FEAT_MBYTE
 			&& (!has_mbyte
 			    || slang->sl_compminlen == 0
 			    || mb_charlen(tword + sp->ts_splitoff)
 						      >= slang->sl_compminlen)
-#endif
 			&& (slang->sl_compsylmax < MAXWLEN
 			    || sp->ts_complen + 1 - sp->ts_compsplit
 							  < slang->sl_compmax)
@@ -4921,11 +4828,9 @@
 
 			/* set su->su_badflags to the caps type at this
 			 * position */
-#ifdef FEAT_MBYTE
 			if (has_mbyte)
 			    n = nofold_len(fword, sp->ts_fidx, su->su_badptr);
 			else
-#endif
 			    n = sp->ts_fidx;
 			su->su_badflags = badword_captype(su->su_badptr + n,
 					       su->su_badptr + su->su_badlen);
@@ -4963,11 +4868,7 @@
 	case STATE_ENDNUL:
 	    /* Past the NUL bytes in the node. */
 	    su->su_badflags = sp->ts_save_badflags;
-	    if (fword[sp->ts_fidx] == NUL
-#ifdef FEAT_MBYTE
-		    && sp->ts_tcharlen == 0
-#endif
-	       )
+	    if (fword[sp->ts_fidx] == NUL && sp->ts_tcharlen == 0)
 	    {
 		/* The badword ends, can't use STATE_PLAIN. */
 		PROF_STORE(sp->ts_state)
@@ -5005,10 +4906,7 @@
 		 * just deleted this byte, accepting it is always cheaper than
 		 * delete + substitute. */
 		if (c == fword[sp->ts_fidx]
-#ifdef FEAT_MBYTE
-			|| (sp->ts_tcharlen > 0 && sp->ts_isdiff != DIFF_NONE)
-#endif
-			)
+			|| (sp->ts_tcharlen > 0 && sp->ts_isdiff != DIFF_NONE))
 		    newscore = 0;
 		else
 		    newscore = SCORE_SUBST;
@@ -5034,7 +4932,6 @@
 		    ++sp->ts_fidx;
 		    tword[sp->ts_twordlen++] = c;
 		    sp->ts_arridx = idxs[arridx];
-#ifdef FEAT_MBYTE
 		    if (newscore == SCORE_SUBST)
 			sp->ts_isdiff = DIFF_YES;
 		    if (has_mbyte)
@@ -5122,7 +5019,6 @@
 			}
 		    }
 		    else
-#endif
 		    {
 			/* If we found a similar char adjust the score.
 			 * We do this after calling go_deeper() because
@@ -5139,7 +5035,6 @@
 	    break;
 
 	case STATE_DEL:
-#ifdef FEAT_MBYTE
 	    /* When past the first byte of a multi-byte char don't try
 	     * delete/insert/swap a character. */
 	    if (has_mbyte && sp->ts_tcharlen > 0)
@@ -5148,7 +5043,6 @@
 		sp->ts_state = STATE_FINAL;
 		break;
 	    }
-#endif
 	    /*
 	     * Try skipping one character in the bad word (delete it).
 	     */
@@ -5181,7 +5075,6 @@
 		 * score if the same character is following "nn" -> "n".  It's
 		 * a bit illogical for soundfold tree but it does give better
 		 * results. */
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    c = mb_ptr2char(fword + sp->ts_fidx);
@@ -5192,7 +5085,6 @@
 			stack[depth].ts_score -= SCORE_DEL - SCORE_DELDUP;
 		}
 		else
-#endif
 		{
 		    ++stack[depth].ts_fidx;
 		    if (fword[sp->ts_fidx] == fword[sp->ts_fidx + 1])
@@ -5274,7 +5166,6 @@
 		sp = &stack[depth];
 		tword[sp->ts_twordlen++] = c;
 		sp->ts_arridx = idxs[n];
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    fl = MB_BYTE2LEN(c);
@@ -5291,7 +5182,6 @@
 		else
 		    fl = 1;
 		if (fl == 1)
-#endif
 		{
 		    /* If the previous character was the same, thus doubling a
 		     * character, give a bonus to the score.  Also for
@@ -5329,7 +5219,6 @@
 		break;
 	    }
 
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		n = MB_CPTR2LEN(p);
@@ -5342,7 +5231,6 @@
 		    c2 = mb_ptr2char(p + n);
 	    }
 	    else
-#endif
 	    {
 		if (p[1] == NUL)
 		    c2 = NUL;
@@ -5379,7 +5267,6 @@
 		PROF_STORE(sp->ts_state)
 		sp->ts_state = STATE_UNSWAP;
 		++depth;
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    fl = mb_char2len(c2);
@@ -5388,7 +5275,6 @@
 		    stack[depth].ts_fidxtry = sp->ts_fidx + n + fl;
 		}
 		else
-#endif
 		{
 		    p[0] = c2;
 		    p[1] = c;
@@ -5406,7 +5292,6 @@
 	case STATE_UNSWAP:
 	    /* Undo the STATE_SWAP swap: "21" -> "12". */
 	    p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		n = MB_PTR2LEN(p);
@@ -5415,7 +5300,6 @@
 		mb_char2bytes(c, p);
 	    }
 	    else
-#endif
 	    {
 		c = *p;
 		*p = p[1];
@@ -5427,7 +5311,6 @@
 	    /* Swap two bytes, skipping one: "123" -> "321".  We change
 	     * "fword" here, it's changed back afterwards at STATE_UNSWAP3. */
 	    p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		n = MB_CPTR2LEN(p);
@@ -5440,7 +5323,6 @@
 		    c3 = mb_ptr2char(p + n + fl);
 	    }
 	    else
-#endif
 	    {
 		c = *p;
 		c2 = p[1];
@@ -5473,7 +5355,6 @@
 		PROF_STORE(sp->ts_state)
 		sp->ts_state = STATE_UNSWAP3;
 		++depth;
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    tl = mb_char2len(c3);
@@ -5483,7 +5364,6 @@
 		    stack[depth].ts_fidxtry = sp->ts_fidx + n + fl + tl;
 		}
 		else
-#endif
 		{
 		    p[0] = p[2];
 		    p[2] = c;
@@ -5500,7 +5380,6 @@
 	case STATE_UNSWAP3:
 	    /* Undo STATE_SWAP3: "321" -> "123" */
 	    p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		n = MB_PTR2LEN(p);
@@ -5514,7 +5393,6 @@
 		p = p + tl;
 	    }
 	    else
-#endif
 	    {
 		c = *p;
 		*p = p[2];
@@ -5546,7 +5424,6 @@
 		sp->ts_state = STATE_UNROT3L;
 		++depth;
 		p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    n = MB_CPTR2LEN(p);
@@ -5558,7 +5435,6 @@
 		    stack[depth].ts_fidxtry = sp->ts_fidx + n + fl;
 		}
 		else
-#endif
 		{
 		    c = *p;
 		    *p = p[1];
@@ -5577,7 +5453,6 @@
 	case STATE_UNROT3L:
 	    /* Undo ROT3L: "231" -> "123" */
 	    p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		n = MB_PTR2LEN(p);
@@ -5588,7 +5463,6 @@
 		mb_char2bytes(c, p);
 	    }
 	    else
-#endif
 	    {
 		c = p[2];
 		p[2] = p[1];
@@ -5611,7 +5485,6 @@
 		sp->ts_state = STATE_UNROT3R;
 		++depth;
 		p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 		if (has_mbyte)
 		{
 		    n = MB_CPTR2LEN(p);
@@ -5623,7 +5496,6 @@
 		    stack[depth].ts_fidxtry = sp->ts_fidx + n + tl;
 		}
 		else
-#endif
 		{
 		    c = p[2];
 		    p[2] = p[1];
@@ -5642,7 +5514,6 @@
 	case STATE_UNROT3R:
 	    /* Undo ROT3R: "312" -> "123" */
 	    p = fword + sp->ts_fidx;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		c = mb_ptr2char(p);
@@ -5653,7 +5524,6 @@
 		mb_char2bytes(c, p + n);
 	    }
 	    else
-#endif
 	    {
 		c = *p;
 		*p = p[1];
@@ -5738,9 +5608,7 @@
 		    }
 		    mch_memmove(p, ftp->ft_to, tl);
 		    stack[depth].ts_fidxtry = sp->ts_fidx + tl;
-#ifdef FEAT_MBYTE
 		    stack[depth].ts_tcharlen = 0;
-#endif
 		    break;
 		}
 	    }
@@ -5809,7 +5677,6 @@
     stack[depth + 1].ts_flags = 0;
 }
 
-#ifdef FEAT_MBYTE
 /*
  * Case-folding may change the number of bytes: Count nr of chars in
  * fword[flen] and return the byte length of that many chars in "word".
@@ -5826,7 +5693,6 @@
 	--i;
     return (int)(p - word);
 }
-#endif
 
 /*
  * "fword" is a good word with case folded.  Find the matching keep-case
@@ -5905,14 +5771,12 @@
 	     * round[depth] == 1: Try using the folded-case character.
 	     * round[depth] == 2: Try using the upper-case character.
 	     */
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		flen = MB_CPTR2LEN(fword + fwordidx[depth]);
 		ulen = MB_CPTR2LEN(uword + uwordidx[depth]);
 	    }
 	    else
-#endif
 		ulen = flen = 1;
 	    if (round[depth] == 1)
 	    {
@@ -6627,7 +6491,6 @@
 similar_chars(slang_T *slang, int c1, int c2)
 {
     int		m1, m2;
-#ifdef FEAT_MBYTE
     char_u	buf[MB_MAXBYTES + 1];
     hashitem_T  *hi;
 
@@ -6641,13 +6504,11 @@
 	    m1 = mb_ptr2char(hi->hi_key + STRLEN(hi->hi_key) + 1);
     }
     else
-#endif
 	m1 = slang->sl_map_array[c1];
     if (m1 == 0)
 	return FALSE;
 
 
-#ifdef FEAT_MBYTE
     if (c2 >= 256)
     {
 	buf[mb_char2bytes(c2, buf)] = 0;
@@ -6658,7 +6519,6 @@
 	    m2 = mb_ptr2char(hi->hi_key + STRLEN(hi->hi_key) + 1);
     }
     else
-#endif
 	m2 = slang->sl_map_array[c2];
 
     return m1 == m2;
@@ -6700,15 +6560,12 @@
 	    break;
 	MB_PTR_BACK(goodword, pgood);
 	MB_PTR_BACK(su->su_badptr, pbad);
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    if (mb_ptr2char(pgood) != mb_ptr2char(pbad))
 		break;
 	}
-	else
-#endif
-	    if (*pgood != *pbad)
+	else if (*pgood != *pbad)
 		break;
     }
 
@@ -7028,11 +6885,9 @@
 	    word = fword;
 	}
 
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    spell_soundfold_wsal(slang, word, res);
 	else
-#endif
 	    spell_soundfold_sal(slang, word, res);
     }
 }
@@ -7048,7 +6903,6 @@
     int		ri = 0;
     int		c;
 
-#ifdef FEAT_MBYTE
     if (has_mbyte)
     {
 	int	prevc = 0;
@@ -7095,7 +6949,6 @@
 	}
     }
     else
-#endif
     {
 	/* The sl_sal_first[] table contains the translation. */
 	for (s = inword; (c = *s) != NUL; ++s)
@@ -7385,7 +7238,6 @@
     res[reslen] = NUL;
 }
 
-#ifdef FEAT_MBYTE
 /*
  * Turn "inword" into its sound-a-like equivalent in "res[MAXWLEN]".
  * Multi-byte version of spell_soundfold().
@@ -7698,7 +7550,6 @@
     }
     res[l] = NUL;
 }
-#endif
 
 /*
  * Compute a score for two sound-a-like words.
@@ -7953,7 +7804,6 @@
     int		t;
     int		bc, gc;
     int		pbc, pgc;
-#ifdef FEAT_MBYTE
     char_u	*p;
     int		wbadword[MAXWLEN];
     int		wgoodword[MAXWLEN];
@@ -7970,7 +7820,6 @@
 	wgoodword[goodlen++] = 0;
     }
     else
-#endif
     {
 	badlen = (int)STRLEN(badword) + 1;
 	goodlen = (int)STRLEN(goodword) + 1;
@@ -7992,14 +7841,12 @@
 	CNT(i, 0) = CNT(i - 1, 0) + SCORE_DEL;
 	for (j = 1; j <= goodlen; ++j)
 	{
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		bc = wbadword[i - 1];
 		gc = wgoodword[j - 1];
 	    }
 	    else
-#endif
 	    {
 		bc = badword[i - 1];
 		gc = goodword[j - 1];
@@ -8024,14 +7871,12 @@
 
 		if (i > 1 && j > 1)
 		{
-#ifdef FEAT_MBYTE
 		    if (has_mbyte)
 		    {
 			pbc = wbadword[i - 2];
 			pgc = wgoodword[j - 2];
 		    }
 		    else
-#endif
 		    {
 			pbc = badword[i - 2];
 			pgc = goodword[j - 2];
@@ -8090,12 +7935,10 @@
     int		    minscore;
     int		    round;
 
-#ifdef FEAT_MBYTE
     /* Multi-byte characters require a bit more work, use a different function
      * to avoid testing "has_mbyte" quite often. */
     if (has_mbyte)
 	return spell_edit_score_limit_w(slang, badword, goodword, limit);
-#endif
 
     /*
      * The idea is to go from start to end over the words.  So long as
@@ -8250,7 +8093,6 @@
     return minscore;
 }
 
-#ifdef FEAT_MBYTE
 /*
  * Multi-byte version of spell_edit_score_limit().
  * Keep it in sync with the above!
@@ -8439,7 +8281,6 @@
 	return SCORE_MAXMAX;
     return minscore;
 }
-#endif
 
 /*
  * ":spellinfo"
@@ -8554,13 +8395,7 @@
 	    n = captype(pat, NULL);
 	    if (n == WF_ONECAP)
 		dumpflags |= DUMPFLAG_ONECAP;
-	    else if (n == WF_ALLCAP
-#ifdef FEAT_MBYTE
-		    && (int)STRLEN(pat) > mb_ptr2len(pat)
-#else
-		    && (int)STRLEN(pat) > 1
-#endif
-		    )
+	    else if (n == WF_ALLCAP && (int)STRLEN(pat) > mb_ptr2len(pat))
 		dumpflags |= DUMPFLAG_ALLCAP;
 	}
     }
diff --git a/src/spell.h b/src/spell.h
index 49ec060..18c9644 100644
--- a/src/spell.h
+++ b/src/spell.h
@@ -44,11 +44,7 @@
 typedef long idx_T;
 #endif
 
-#ifdef FEAT_MBYTE
 typedef int salfirst_T;
-#else
-typedef short salfirst_T;
-#endif
 
 /*
  * Structure used to store words and other info for one language, loaded from
@@ -132,12 +128,8 @@
 				   load */
 
     int		sl_has_map;	/* TRUE if there is a MAP line */
-#ifdef FEAT_MBYTE
     hashtab_T	sl_map_hash;	/* MAP for multi-byte chars */
     int		sl_map_array[256]; /* MAP for first 256 chars */
-#else
-    char_u	sl_map_array[256]; /* MAP for first 256 chars */
-#endif
     hashtab_T	sl_sounddone;	/* table with soundfolded words that have
 				   handled, see add_sound_suggest() */
 };
@@ -213,11 +205,9 @@
     char_u	*sm_oneof;	/* letters from () or NULL */
     char_u	*sm_rules;	/* rules like ^, $, priority */
     char_u	*sm_to;		/* replacement. */
-#ifdef FEAT_MBYTE
     int		*sm_lead_w;	/* wide character copy of "sm_lead" */
     int		*sm_oneof_w;	/* wide character copy of "sm_oneof" */
     int		*sm_to_w;	/* wide character copy of "sm_to" */
-#endif
 } salitem_T;
 
 /* Values for SP_*ERROR are negative, positive values are used by
@@ -260,41 +250,34 @@
  * differ from what the .spl file uses.
  * These must not be called with negative number!
  */
-#ifndef FEAT_MBYTE
-/* Non-multi-byte implementation. */
-# define SPELL_TOFOLD(c) ((c) < 256 ? (int)spelltab.st_fold[c] : (c))
-# define SPELL_TOUPPER(c) ((c) < 256 ? (int)spelltab.st_upper[c] : (c))
-# define SPELL_ISUPPER(c) ((c) < 256 ? spelltab.st_isu[c] : FALSE)
-#else
-# if defined(HAVE_WCHAR_H)
-#  include <wchar.h>	    /* for towupper() and towlower() */
-# endif
+#if defined(HAVE_WCHAR_H)
+# include <wchar.h>	    /* for towupper() and towlower() */
+#endif
 /* Multi-byte implementation.  For Unicode we can call utf_*(), but don't do
  * that for ASCII, because we don't want to use 'casemap' here.  Otherwise use
  * the "w" library function for characters above 255 if available. */
-# ifdef HAVE_TOWLOWER
-#  define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
+#ifdef HAVE_TOWLOWER
+# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
 	    : (c) < 256 ? (int)spelltab.st_fold[c] : (int)towlower(c))
-# else
-#  define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
+#else
+# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
 	    : (c) < 256 ? (int)spelltab.st_fold[c] : (c))
-# endif
+#endif
 
-# ifdef HAVE_TOWUPPER
-#  define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
+#ifdef HAVE_TOWUPPER
+# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
 	    : (c) < 256 ? (int)spelltab.st_upper[c] : (int)towupper(c))
-# else
-#  define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
+#else
+# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
 	    : (c) < 256 ? (int)spelltab.st_upper[c] : (c))
-# endif
+#endif
 
-# ifdef HAVE_ISWUPPER
-#  define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
+#ifdef HAVE_ISWUPPER
+# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
 	    : (c) < 256 ? spelltab.st_isu[c] : iswupper(c))
-# else
-#  define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
+#else
+# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
 	    : (c) < 256 ? spelltab.st_isu[c] : (FALSE))
-# endif
 #endif
 
 #ifdef FEAT_SPELL
diff --git a/src/spellfile.c b/src/spellfile.c
index 7d3a486..00f6b7c 100644
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -306,9 +306,7 @@
 static int read_compound(FILE *fd, slang_T *slang, int len);
 static int set_sofo(slang_T *lp, char_u *from, char_u *to);
 static void set_sal_first(slang_T *lp);
-#ifdef FEAT_MBYTE
 static int *mb_str2wide(char_u *s);
-#endif
 static int spell_read_tree(FILE *fd, char_u **bytsp, idx_T **idxsp, int prefixtree, int prefixcnt);
 static idx_T read_tree_node(FILE *fd, char_u *byts, idx_T *idxs, int maxidx, idx_T startidx, int prefixtree, int maxprefcondnr);
 static void set_spell_charflags(char_u *flags, int cnt, char_u *upp);
@@ -1062,7 +1060,6 @@
 	    return ccnt;
 	}
 
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    /* convert the multi-byte strings to wide char strings */
@@ -1088,7 +1085,6 @@
 		return SP_OTHERERROR;
 	    }
 	}
-#endif
     }
 
     if (gap->ga_len > 0)
@@ -1104,7 +1100,6 @@
 	smp->sm_oneof = NULL;
 	smp->sm_rules = p;
 	smp->sm_to = NULL;
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    smp->sm_lead_w = mb_str2wide(smp->sm_lead);
@@ -1112,7 +1107,6 @@
 	    smp->sm_oneof_w = NULL;
 	    smp->sm_to_w = NULL;
 	}
-#endif
 	++gap->ga_len;
     }
 
@@ -1268,10 +1262,8 @@
      * Inserting backslashes may double the length, "^\(\)$<Nul>" is 7 bytes.
      * Conversion to utf-8 may double the size. */
     c = todo * 2 + 7;
-#ifdef FEAT_MBYTE
     if (enc_utf8)
 	c += todo * 2;
-#endif
     pat = alloc((unsigned)c);
     if (pat == NULL)
 	return SP_OTHERERROR;
@@ -1367,11 +1359,9 @@
 	{
 	    if (c == '?' || c == '+' || c == '~')
 		*pp++ = '\\';	    /* "a?" becomes "a\?", "a+" becomes "a\+" */
-#ifdef FEAT_MBYTE
 	    if (enc_utf8)
 		pp += mb_char2bytes(c, pp);
 	    else
-#endif
 		*pp++ = c;
 	}
     }
@@ -1401,7 +1391,6 @@
 {
     int		i;
 
-#ifdef FEAT_MBYTE
     garray_T	*gap;
     char_u	*s;
     char_u	*p;
@@ -1468,7 +1457,6 @@
 	}
     }
     else
-#endif
     {
 	/* mapping bytes to bytes is done in sl_sal_first[] */
 	if (STRLEN(from) != STRLEN(to))
@@ -1500,19 +1488,16 @@
     smp = (salitem_T *)gap->ga_data;
     for (i = 0; i < gap->ga_len; ++i)
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    /* Use the lowest byte of the first character.  For latin1 it's
 	     * the character, for other encodings it should differ for most
 	     * characters. */
 	    c = *smp[i].sm_lead_w & 0xff;
 	else
-#endif
 	    c = *smp[i].sm_lead;
 	if (sfirst[c] == -1)
 	{
 	    sfirst[c] = i;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		int		n;
@@ -1540,12 +1525,10 @@
 			smp[i] = tsal;
 		    }
 	    }
-#endif
 	}
     }
 }
 
-#ifdef FEAT_MBYTE
 /*
  * Turn a multi-byte string into a wide character string.
  * Return it in allocated memory (NULL for out-of-memory)
@@ -1566,7 +1549,6 @@
     }
     return res;
 }
-#endif
 
 /*
  * Read a tree from the .spl or .sug file.
@@ -1820,11 +1802,7 @@
     char	ae_comppermit;	/* COMPOUNDPERMITFLAG found */
 };
 
-#ifdef FEAT_MBYTE
-# define AH_KEY_LEN 17		/* 2 x 8 bytes + NUL */
-#else
-# define AH_KEY_LEN 7		/* 6 digits + NUL */
-#endif
+#define AH_KEY_LEN 17		/* 2 x 8 bytes + NUL */
 
 /* Affix header from ".aff" file.  Used for af_pref and af_suff. */
 typedef struct affheader_S
@@ -2271,7 +2249,6 @@
 
 	/* Convert from "SET" to 'encoding' when needed. */
 	vim_free(pc);
-#ifdef FEAT_MBYTE
 	if (spin->si_conv.vc_type != CONV_NONE)
 	{
 	    pc = string_convert(&spin->si_conv, rline, NULL);
@@ -2284,7 +2261,6 @@
 	    line = pc;
 	}
 	else
-#endif
 	{
 	    pc = NULL;
 	    line = rline;
@@ -2319,7 +2295,6 @@
 	{
 	    if (is_aff_rule(items, itemcnt, "SET", 2) && aff->af_enc == NULL)
 	    {
-#ifdef FEAT_MBYTE
 		/* Setup for conversion from "ENC" to 'encoding'. */
 		aff->af_enc = enc_canonize(items[1]);
 		if (aff->af_enc != NULL && !spin->si_ascii
@@ -2328,9 +2303,6 @@
 		    smsg(_("Conversion in %s not supported: from %s to %s"),
 					       fname, aff->af_enc, p_enc);
 		spin->si_conv.vc_fail = TRUE;
-#else
-		    smsg(_("Conversion in %s not supported"), fname);
-#endif
 	    }
 	    else if (is_aff_rule(items, itemcnt, "FLAG", 2)
 					      && aff->af_flagtype == AFT_CHAR)
@@ -2772,13 +2744,8 @@
 			 * be empty or start with the same letter. */
 			if (aff_entry->ae_chop != NULL
 				&& aff_entry->ae_add != NULL
-#ifdef FEAT_MBYTE
 				&& aff_entry->ae_chop[(*mb_ptr2len)(
-						   aff_entry->ae_chop)] == NUL
-#else
-				&& aff_entry->ae_chop[1] == NUL
-#endif
-				)
+						   aff_entry->ae_chop)] == NUL)
 			{
 			    int		c, c_up;
 
@@ -2803,7 +2770,7 @@
 				    if (aff_entry->ae_cond != NULL)
 				    {
 					char_u	buf[MAXLINELEN];
-#ifdef FEAT_MBYTE
+
 					if (has_mbyte)
 					{
 					    onecap_copy(items[4], buf, TRUE);
@@ -2811,7 +2778,6 @@
 								   spin, buf);
 					}
 					else
-#endif
 					    *aff_entry->ae_cond = c_up;
 					if (aff_entry->ae_cond != NULL)
 					{
@@ -2947,11 +2913,7 @@
 		    /* Check that every character appears only once. */
 		    for (p = items[1]; *p != NUL; )
 		    {
-#ifdef FEAT_MBYTE
 			c = mb_ptr2char_adv(&p);
-#else
-			c = *p++;
-#endif
 			if ((spin->si_map.ga_len > 0
 				    && vim_strchr(spin->si_map.ga_data, c)
 								      != NULL)
@@ -3034,11 +2996,7 @@
 	 * Don't write one for utf-8 either, we use utf_*() and
 	 * mb_get_class(), the list of chars in the file will be incomplete.
 	 */
-	if (!spin->si_ascii
-#ifdef FEAT_MBYTE
-		&& !enc_utf8
-#endif
-		)
+	if (!spin->si_ascii && !enc_utf8)
 	{
 	    if (fol == NULL || low == NULL || upp == NULL)
 		smsg(_("Missing FOL/LOW/UPP line in %s"), fname);
@@ -3243,21 +3201,13 @@
     }
     else
     {
-#ifdef FEAT_MBYTE
 	res = mb_ptr2char_adv(pp);
-#else
-	res = *(*pp)++;
-#endif
 	if (flagtype == AFT_LONG || (flagtype == AFT_CAPLONG
 						 && res >= 'A' && res <= 'Z'))
 	{
 	    if (**pp == NUL)
 		return 0;
-#ifdef FEAT_MBYTE
 	    res = mb_ptr2char_adv(pp) + (res << 16);
-#else
-	    res = *(*pp)++ + (res << 16);
-#endif
 	}
     }
     return res;
@@ -3381,18 +3331,10 @@
 	case AFT_LONG:
 	    for (p = afflist; *p != NUL; )
 	    {
-#ifdef FEAT_MBYTE
 		n = mb_ptr2char_adv(&p);
-#else
-		n = *p++;
-#endif
 		if ((flagtype == AFT_LONG || (n >= 'A' && n <= 'Z'))
 								 && *p != NUL)
-#ifdef FEAT_MBYTE
 		    n = mb_ptr2char_adv(&p) + (n << 16);
-#else
-		    n = *p++ + (n << 16);
-#endif
 		if (n == flag)
 		    return TRUE;
 	    }
@@ -3589,7 +3531,6 @@
 	    continue;	/* empty line */
 	line[l] = NUL;
 
-#ifdef FEAT_MBYTE
 	/* Convert from "SET" to 'encoding' when needed. */
 	if (spin->si_conv.vc_type != CONV_NONE)
 	{
@@ -3603,7 +3544,6 @@
 	    w = pc;
 	}
 	else
-#endif
 	{
 	    pc = NULL;
 	    w = line;
@@ -3930,7 +3870,6 @@
 			    if (ae->ae_chop != NULL)
 			    {
 				/* Skip chop string. */
-#ifdef FEAT_MBYTE
 				if (has_mbyte)
 				{
 				    i = mb_charlen(ae->ae_chop);
@@ -3938,7 +3877,6 @@
 					MB_PTR_ADV(p);
 				}
 				else
-#endif
 				    p += STRLEN(ae->ae_chop);
 			    }
 			    STRCAT(newword, p);
@@ -4162,7 +4100,6 @@
 
 	/* Convert from "/encoding={encoding}" to 'encoding' when needed. */
 	vim_free(pc);
-#ifdef FEAT_MBYTE
 	if (spin->si_conv.vc_type != CONV_NONE)
 	{
 	    pc = string_convert(&spin->si_conv, rline, NULL);
@@ -4175,7 +4112,6 @@
 	    line = pc;
 	}
 	else
-#endif
 	{
 	    pc = NULL;
 	    line = rline;
@@ -4194,7 +4130,6 @@
 						       fname, lnum, line - 1);
 		else
 		{
-#ifdef FEAT_MBYTE
 		    char_u	*enc;
 
 		    /* Setup for conversion to 'encoding'. */
@@ -4207,9 +4142,6 @@
 							  fname, line, p_enc);
 		    vim_free(enc);
 		    spin->si_conv.vc_fail = TRUE;
-#else
-		    smsg(_("Conversion in %s not supported"), fname);
-#endif
 		}
 		continue;
 	    }
@@ -4981,11 +4913,9 @@
 	l = 0;
 	for (i = 128; i < 256; ++i)
 	{
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 		l += mb_char2bytes(spelltab.st_fold[i], folchars + l);
 	    else
-#endif
 		folchars[l++] = spelltab.st_fold[i];
 	}
 	put_bytes(fd, (long_u)(1 + 128 + 2 + l), 4);	/* <sectionlen> */
@@ -6112,10 +6042,8 @@
 		    error = TRUE;
 	    }
 
-#ifdef FEAT_MBYTE
 	    /* Free any conversion stuff. */
 	    convert_setup(&spin.si_conv, NULL, NULL);
-#endif
 	}
 
 	if (spin.si_compflags != NULL && spin.si_nobreak)
@@ -6488,15 +6416,10 @@
 	    emsg(_(e_affform));
 	    return FAIL;
 	}
-#ifdef FEAT_MBYTE
 	f = mb_ptr2char_adv(&pf);
 	l = mb_ptr2char_adv(&pl);
 	u = mb_ptr2char_adv(&pu);
-#else
-	f = *pf++;
-	l = *pl++;
-	u = *pu++;
-#endif
+
 	/* Every character that appears is a word character. */
 	if (f < 256)
 	    new_st.st_isw[f] = TRUE;
@@ -6570,11 +6493,7 @@
 
 	if (*p != NUL)
 	{
-#ifdef FEAT_MBYTE
 	    c = mb_ptr2char_adv(&p);
-#else
-	    c = *p++;
-#endif
 	    new_st.st_fold[i + 128] = c;
 	    if (i + 128 != c && new_st.st_isu[i + 128] && c < 256)
 		new_st.st_upper[c] = i + 128;
@@ -6675,9 +6594,7 @@
     /* Init the array and hash tables empty. */
     for (i = 0; i < 256; ++i)
 	lp->sl_map_array[i] = 0;
-#ifdef FEAT_MBYTE
     hash_init(&lp->sl_map_hash);
-#endif
 
     /*
      * The similar characters are stored separated with slashes:
@@ -6686,11 +6603,7 @@
      */
     for (p = map; *p != NUL; )
     {
-#ifdef FEAT_MBYTE
 	c = mb_cptr2char_adv(&p);
-#else
-	c = *p++;
-#endif
 	if (c == '/')
 	    headc = 0;
 	else
@@ -6698,7 +6611,6 @@
 	    if (headc == 0)
 		 headc = c;
 
-#ifdef FEAT_MBYTE
 	    /* Characters above 255 don't fit in sl_map_array[], put them in
 	     * the hash table.  Each entry is the char, a NUL the headchar and
 	     * a NUL. */
@@ -6730,7 +6642,6 @@
 		}
 	    }
 	    else
-#endif
 		lp->sl_map_array[c] = headc;
 	}
     }
diff --git a/src/structs.h b/src/structs.h
index 5f148a0..3216c58 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1103,9 +1103,7 @@
 {
     char_u	*vir_line;	/* text of the current line */
     FILE	*vir_fd;	/* file descriptor */
-#ifdef FEAT_MBYTE
     vimconv_T	vir_conv;	/* encoding conversion */
-#endif
     int		vir_version;	/* viminfo version detected or -1 */
     garray_T	vir_barlines;	/* lines starting with | */
 } vir_T;
@@ -2013,16 +2011,12 @@
     /* for spell checking */
     garray_T	b_langp;	/* list of pointers to slang_T, see spell.c */
     char_u	b_spell_ismw[256];/* flags: is midword char */
-# ifdef FEAT_MBYTE
     char_u	*b_spell_ismw_mb; /* multi-byte midword chars */
-# endif
     char_u	*b_p_spc;	/* 'spellcapcheck' */
     regprog_T	*b_cap_prog;	/* program for 'spellcapcheck' */
     char_u	*b_p_spf;	/* 'spellfile' */
     char_u	*b_p_spl;	/* 'spelllang' */
-# ifdef FEAT_MBYTE
     int		b_cjk;		/* all CJK letters as OK */
-# endif
 #endif
 #if !defined(FEAT_SYN_HL) && !defined(FEAT_SPELL)
     int		dummy;
@@ -2233,9 +2227,7 @@
     unsigned	b_bkc_flags;    /* flags for 'backupcopy' */
     int		b_p_ci;		/* 'copyindent' */
     int		b_p_bin;	/* 'binary' */
-#ifdef FEAT_MBYTE
     int		b_p_bomb;	/* 'bomb' */
-#endif
     char_u	*b_p_bh;	/* 'bufhidden' */
     char_u	*b_p_bt;	/* 'buftype' */
 #ifdef FEAT_QUICKFIX
@@ -2270,9 +2262,7 @@
     int		b_p_et;		/* 'expandtab' */
     int		b_p_et_nobin;	/* b_p_et saved for binary mode */
     int	        b_p_et_nopaste; /* b_p_et saved for paste mode */
-#ifdef FEAT_MBYTE
     char_u	*b_p_fenc;	/* 'fileencoding' */
-#endif
     char_u	*b_p_ff;	/* 'fileformat' */
     char_u	*b_p_ft;	/* 'filetype' */
     char_u	*b_p_fo;	/* 'formatoptions' */
@@ -2304,9 +2294,7 @@
 #ifdef FEAT_LISP
     int		b_p_lisp;	/* 'lisp' */
 #endif
-#ifdef FEAT_MBYTE
     char_u	*b_p_menc;	/* 'makeencoding' */
-#endif
     char_u	*b_p_mps;	/* 'matchpairs' */
     int		b_p_ml;		/* 'modeline' */
     int		b_p_ml_nobin;	/* b_p_ml saved for binary mode */
@@ -2425,11 +2413,9 @@
 
     int		b_start_eol;	/* last line had eol when it was read */
     int		b_start_ffc;	/* first char of 'ff' when edit started */
-#ifdef FEAT_MBYTE
     char_u	*b_start_fenc;	/* 'fileencoding' when edit started or NULL */
     int		b_bad_char;	/* "++bad=" argument when edit started or 0 */
     int		b_start_bomb;	/* 'bomb' when it was read */
-#endif
 
 #ifdef FEAT_EVAL
     dictitem_T	b_bufvar;	/* variable for "b:" Dictionary */
@@ -3107,10 +3093,8 @@
     int		prechar;	/* prefix character (optional, always 'g') */
     int		cmdchar;	/* command character */
     int		nchar;		/* next command character (optional) */
-#ifdef FEAT_MBYTE
     int		ncharC1;	/* first composing character (optional) */
     int		ncharC2;	/* second composing character (optional) */
-#endif
     int		extra_char;	/* yet another character (optional) */
     long	opcount;	/* count before an operator */
     long	count0;		/* count before command, default 0 */
diff --git a/src/syntax.c b/src/syntax.c
index b48ca00..16c75f2 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -1974,12 +1974,9 @@
 	      if (vim_iswordp_buf(line + current_col, syn_buf)
 		      && (current_col == 0
 			  || !vim_iswordp_buf(line + current_col - 1
-#ifdef FEAT_MBYTE
 			      - (has_mbyte
 				  ? (*mb_head_off)(line, line + current_col - 1)
-				  : 0)
-#endif
-			       , syn_buf)))
+				  : 0) , syn_buf)))
 	      {
 		syn_id = check_keyword_id(line, (int)current_col,
 					 &endcol, &flags, &next_list, cur_si,
@@ -3355,11 +3352,9 @@
     kwlen = 0;
     do
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    kwlen += (*mb_ptr2len)(kwp + kwlen);
 	else
-#endif
 	    ++kwlen;
     }
     while (vim_iswordp_buf(kwp + kwlen, syn_buf));
@@ -4668,17 +4663,15 @@
 	}
 	else if (flagtab[fidx].argtype == 11 && arg[5] == '=')
 	{
-#ifdef FEAT_MBYTE
 	    /* cchar=? */
 	    if (has_mbyte)
 	    {
-# ifdef FEAT_CONCEAL
+#ifdef FEAT_CONCEAL
 		*conceal_char = mb_ptr2char(arg + 6);
-# endif
+#endif
 		arg += mb_ptr2len(arg + 6) - 1;
 	    }
 	    else
-#endif
 	    {
 #ifdef FEAT_CONCEAL
 		*conceal_char = arg[6];
@@ -4948,7 +4941,6 @@
 			    kw = p + 1;		/* skip over the "]" */
 			    break;
 			}
-#ifdef FEAT_MBYTE
 			if (has_mbyte)
 			{
 			    int l = (*mb_ptr2len)(p + 1);
@@ -4957,7 +4949,6 @@
 			    p += l;
 			}
 			else
-#endif
 			{
 			    p[0] = p[1];
 			    ++p;
diff --git a/src/tag.c b/src/tag.c
index e14be6b..b70716f 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -1349,9 +1349,7 @@
 #endif
 
     pat_T	orgpat;			/* holds unconverted pattern info */
-#ifdef FEAT_MBYTE
     vimconv_T	vimconv;
-#endif
 
 #ifdef FEAT_TAG_BINS
     int		findall = (mincount == MAXCOL || mincount == TAG_MANY);
@@ -1387,9 +1385,7 @@
 
     help_save = curbuf->b_help;
     orgpat.pat = pat;
-#ifdef FEAT_MBYTE
     vimconv.vc_type = CONV_NONE;
-#endif
 
     /*
      * Allocate memory for the buffers that are used
@@ -1725,7 +1721,6 @@
 	    }
 line_read_in:
 
-#ifdef FEAT_MBYTE
 	    if (vimconv.vc_type != CONV_NONE)
 	    {
 		char_u	*conv_line;
@@ -1752,7 +1747,6 @@
 		    }
 		}
 	    }
-#endif
 
 
 #ifdef FEAT_EMACS_TAGS
@@ -1846,7 +1840,6 @@
 		    if (STRNCMP(lbuf, "!_TAG_FILE_SORTED\t", 18) == 0)
 			tag_file_sorted = lbuf[18];
 #endif
-#ifdef FEAT_MBYTE
 		    if (STRNCMP(lbuf, "!_TAG_FILE_ENCODING\t", 20) == 0)
 		    {
 			/* Prepare to convert every line from the specified
@@ -1856,7 +1849,6 @@
 			*p = NUL;
 			convert_setup(&vimconv, lbuf + 20, p_enc);
 		    }
-#endif
 
 		    /* Read the next line.  Unrecognized flags are ignored. */
 		    continue;
@@ -2472,10 +2464,8 @@
 	    vim_free(incstack[incstack_idx].etag_fname);
 	}
 #endif
-#ifdef FEAT_MBYTE
 	if (vimconv.vc_type != CONV_NONE)
 	    convert_setup(&vimconv, NULL, NULL);
-#endif
 
 #ifdef FEAT_TAG_BINS
 	tag_file_sorted = NUL;
diff --git a/src/term.c b/src/term.c
index 5180868..47d2bda 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2585,7 +2585,6 @@
 }
 
 
-#if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Sometimes a byte out of a multi-byte character is written with out_char().
  * To avoid flushing half of the character, call this function first.
@@ -2596,7 +2595,6 @@
     if (enc_dbcs != 0 && out_pos >= OUT_SIZE - MB_MAXBYTES)
 	out_flush();
 }
-#endif
 
 #ifdef FEAT_GUI
 /*
@@ -3620,7 +3618,6 @@
     }
 }
 
-# if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Check how the terminal treats ambiguous character width (UAX #11).
  * First, we move the cursor to (1, 0) and print a test ambiguous character
@@ -3666,7 +3663,6 @@
 	 (void)vpeekc_nomap();
     }
 }
-# endif
 
 /*
  * Similar to requesting the version string: Request the terminal background
@@ -4606,9 +4602,7 @@
 	    {
 		int col = 0;
 		int semicols = 0;
-#ifdef FEAT_MBYTE
 		int row_char = NUL;
-#endif
 
 		extra = 0;
 		for (i = 2 + (tp[0] != CSI); i < len
@@ -4617,9 +4611,7 @@
 		    if (tp[i] == ';' && ++semicols == 1)
 		    {
 			extra = i + 1;
-#ifdef FEAT_MBYTE
 			row_char = tp[i - 1];
-#endif
 		    }
 		if (i == len)
 		{
@@ -4629,7 +4621,6 @@
 		if (extra > 0)
 		    col = atoi((char *)tp + extra);
 
-#ifdef FEAT_MBYTE
 		/* Eat it when it has 2 arguments and ends in 'R'. Also when
 		 * u7_status is not "sent", it may be from a previous Vim that
 		 * just exited.  But not for <S-F3>, it sends something
@@ -4672,10 +4663,9 @@
 		    set_vim_var_string(VV_TERMU7RESP, tp, slen);
 # endif
 		}
-		else
-#endif
 		/* eat it when at least one digit and ending in 'c' */
-		if (*T_CRV != NUL && i > 2 + (tp[0] != CSI) && tp[i] == 'c')
+		else if (*T_CRV != NUL && i > 2 + (tp[0] != CSI)
+							       && tp[i] == 'c')
 		{
 		    int version = col;
 
@@ -5973,11 +5963,9 @@
 	if (key_name[0] == KS_KEY)
 	{
 	    /* from ":set <M-b>=xx" */
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 		new_slen += (*mb_char2bytes)(key_name[1], string + new_slen);
 	    else
-#endif
 		string[new_slen++] = key_name[1];
 	}
 	else if (new_slen == 0 && key_name[0] == KS_EXTRA
@@ -6257,10 +6245,8 @@
 	    }
 	}
 
-#ifdef FEAT_MBYTE
 	/* skip multibyte char correctly */
 	for (i = (*mb_ptr2len)(src); i > 0; --i)
-#endif
 	{
 	    /*
 	     * If the character is K_SPECIAL, replace it with K_SPECIAL
diff --git a/src/ui.c b/src/ui.c
index f931124..63cc8bb 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -40,7 +40,7 @@
     /* Don't output anything in silent mode ("ex -s") unless 'verbose' set */
     if (!(silent_mode && p_verbose == 0))
     {
-#if defined(FEAT_MBYTE) && !defined(WIN3264)
+#if !defined(WIN3264)
 	char_u	*tofree = NULL;
 
 	if (output_conv.vc_type != CONV_NONE)
@@ -54,10 +54,10 @@
 
 	mch_write(s, len);
 
-#if defined(FEAT_MBYTE) && !defined(WIN3264)
+# if !defined(WIN3264)
 	if (output_conv.vc_type != CONV_NONE)
 	    vim_free(tofree);
-#endif
+# endif
     }
 #endif
 }
@@ -516,10 +516,8 @@
 	{
 	    start = VIsual;
 	    end = curwin->w_cursor;
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 		end.col += (*mb_ptr2len)(ml_get_cursor()) - 1;
-#endif
 	}
 	else
 	{
@@ -821,9 +819,7 @@
 
     row = check_row(row);
     col = check_col(col);
-#ifdef FEAT_MBYTE
     col = mb_fix_col(col, row);
-#endif
 
     cb->start.lnum  = row;
     cb->start.col   = col;
@@ -927,9 +923,7 @@
 
     row = check_row(row);
     col = check_col(col);
-#ifdef FEAT_MBYTE
     col = mb_fix_col(col, row);
-#endif
 
     if (col == (int)cb->prev.col && row == cb->prev.lnum && !repeated_click)
 	return;
@@ -995,21 +989,17 @@
 			    cb->origin_start_col, row, (int)Columns);
 		else
 		{
-#ifdef FEAT_MBYTE
 		    if (has_mbyte && mb_lefthalve(row, col))
 			slen = 2;
-#endif
 		    clip_update_modeless_selection(cb, cb->origin_row,
 			    cb->origin_start_col, row, col + slen);
 		}
 	    }
 	    else
 	    {
-#ifdef FEAT_MBYTE
 		if (has_mbyte
 			&& mb_lefthalve(cb->origin_row, cb->origin_start_col))
 		    slen = 2;
-#endif
 		if (col >= (int)cb->word_end_col)
 		    clip_update_modeless_selection(cb, row, cb->word_end_col,
 			    cb->origin_row, cb->origin_start_col + slen);
@@ -1243,9 +1233,7 @@
     int		line_end_col;
     int		add_newline_flag = FALSE;
     int		len;
-#ifdef FEAT_MBYTE
     char_u	*p;
-#endif
     int		row1 = clip_star.start.lnum;
     int		col1 = clip_star.start.col;
     int		row2 = clip_star.end.lnum;
@@ -1267,23 +1255,19 @@
     {
 	row = col1; col1 = col2; col2 = row;
     }
-#ifdef FEAT_MBYTE
     /* correct starting point for being on right halve of double-wide char */
     p = ScreenLines + LineOffset[row1];
     if (enc_dbcs != 0)
 	col1 -= (*mb_head_off)(p, p + col1);
     else if (enc_utf8 && p[col1] == 0)
 	--col1;
-#endif
 
     /* Create a temporary buffer for storing the text */
     len = (row2 - row1 + 1) * Columns + 1;
-#ifdef FEAT_MBYTE
     if (enc_dbcs != 0)
 	len *= 2;	/* max. 2 bytes per display cell */
     else if (enc_utf8)
 	len *= MB_MAXBYTES;
-#endif
     buffer = lalloc((long_u)len, TRUE);
     if (buffer == NULL)	    /* out of memory */
 	return;
@@ -1322,7 +1306,6 @@
 
 	if (row < screen_Rows && end_col <= screen_Columns)
 	{
-#ifdef FEAT_MBYTE
 	    if (enc_dbcs != 0)
 	    {
 		int	i;
@@ -1373,7 +1356,6 @@
 		}
 	    }
 	    else
-#endif
 	    {
 		STRNCPY(bufp, ScreenLines + LineOffset[row] + start_col,
 							 end_col - start_col);
@@ -1421,51 +1403,35 @@
     int		start_class;
     int		temp_col;
     char_u	*p;
-#ifdef FEAT_MBYTE
     int		mboff;
-#endif
 
     if (row >= screen_Rows || col >= screen_Columns || ScreenLines == NULL)
 	return;
 
     p = ScreenLines + LineOffset[row];
-#ifdef FEAT_MBYTE
     /* Correct for starting in the right halve of a double-wide char */
     if (enc_dbcs != 0)
 	col -= dbcs_screen_head_off(p, p + col);
     else if (enc_utf8 && p[col] == 0)
 	--col;
-#endif
     start_class = CHAR_CLASS(p[col]);
 
     temp_col = col;
     for ( ; temp_col > 0; temp_col--)
-#ifdef FEAT_MBYTE
 	if (enc_dbcs != 0
 		   && (mboff = dbcs_screen_head_off(p, p + temp_col - 1)) > 0)
 	    temp_col -= mboff;
-	else
-#endif
-	if (CHAR_CLASS(p[temp_col - 1]) != start_class
-#ifdef FEAT_MBYTE
-		&& !(enc_utf8 && p[temp_col - 1] == 0)
-#endif
-		)
+	else if (CHAR_CLASS(p[temp_col - 1]) != start_class
+		&& !(enc_utf8 && p[temp_col - 1] == 0))
 	    break;
     cb->word_start_col = temp_col;
 
     temp_col = col;
     for ( ; temp_col < screen_Columns; temp_col++)
-#ifdef FEAT_MBYTE
 	if (enc_dbcs != 0 && dbcs_ptr2cells(p + temp_col) == 2)
 	    ++temp_col;
-	else
-#endif
-	if (CHAR_CLASS(p[temp_col]) != start_class
-#ifdef FEAT_MBYTE
-		&& !(enc_utf8 && p[temp_col] == 0)
-#endif
-		)
+	else if (CHAR_CLASS(p[temp_col]) != start_class
+		&& !(enc_utf8 && p[temp_col] == 0))
 	    break;
     cb->word_end_col = temp_col;
 }
@@ -1820,11 +1786,9 @@
     int		len;
     int		try;
     static int	did_read_something = FALSE;
-# ifdef FEAT_MBYTE
     static char_u *rest = NULL;	    /* unconverted rest of previous read */
     static int	restlen = 0;
     int		unconverted;
-# endif
 #endif
 
 #ifdef FEAT_GUI
@@ -1860,7 +1824,6 @@
     inbufcount = 0;
 # else
 
-#  ifdef FEAT_MBYTE
     if (rest != NULL)
     {
 	/* Use remainder of previous call, starts with an invalid character
@@ -1881,16 +1844,12 @@
     }
     else
 	unconverted = 0;
-#  endif
 
     len = 0;	/* to avoid gcc warning */
     for (try = 0; try < 100; ++try)
     {
 	size_t readlen = (size_t)((INBUFLEN - inbufcount)
-#  ifdef FEAT_MBYTE
-			    / input_conv.vc_factor
-#  endif
-			    );
+			    / input_conv.vc_factor);
 #  ifdef VMS
 	len = vms_read((char *)inbuf + inbufcount, readlen);
 #  else
@@ -1936,7 +1895,6 @@
     }
     else
     {
-# ifdef FEAT_MBYTE
 	/*
 	 * May perform conversion on the input characters.
 	 * Include the unconverted rest of the previous call.
@@ -1952,7 +1910,6 @@
 				     len + unconverted, INBUFLEN - inbufcount,
 				       rest == NULL ? &rest : NULL, &restlen);
 	}
-# endif
 	while (len-- > 0)
 	{
 	    /*
@@ -2014,8 +1971,6 @@
 }
 #endif
 
-#if defined(FEAT_CLIPBOARD) || defined(FEAT_GUI) || defined(FEAT_RIGHTLEFT) \
-	|| defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Check bounds for column number
  */
@@ -2041,7 +1996,6 @@
 	return (int)screen_Rows - 1;
     return row;
 }
-#endif
 
 /*
  * Stuff for the X clipboard.  Shared between VMS and Unix.
@@ -2066,10 +2020,8 @@
 }
 
 static Atom	vim_atom;	/* Vim's own special selection format */
-#ifdef FEAT_MBYTE
 static Atom	vimenc_atom;	/* Vim's extended selection format */
 static Atom	utf8_atom;
-#endif
 static Atom	compound_text_atom;
 static Atom	text_atom;
 static Atom	targets_atom;
@@ -2079,10 +2031,8 @@
 x11_setup_atoms(Display *dpy)
 {
     vim_atom	       = XInternAtom(dpy, VIM_ATOM_NAME,   False);
-#ifdef FEAT_MBYTE
     vimenc_atom	       = XInternAtom(dpy, VIMENC_ATOM_NAME,False);
     utf8_atom	       = XInternAtom(dpy, "UTF8_STRING",   False);
-#endif
     compound_text_atom = XInternAtom(dpy, "COMPOUND_TEXT", False);
     text_atom	       = XInternAtom(dpy, "TEXT",	   False);
     targets_atom       = XInternAtom(dpy, "TARGETS",	   False);
@@ -2170,9 +2120,7 @@
     char_u	*p;
     char	**text_list = NULL;
     VimClipboard	*cbd;
-#ifdef FEAT_MBYTE
     char_u	*tmpbuf = NULL;
-#endif
 
     if (*sel_atom == clip_plus.sel_atom)
 	cbd = &clip_plus;
@@ -2193,7 +2141,6 @@
 	len--;
     }
 
-#ifdef FEAT_MBYTE
     else if (*type == vimenc_atom)
     {
 	char_u		*enc;
@@ -2221,17 +2168,10 @@
 	    convert_setup(&conv, NULL, NULL);
 	}
     }
-#endif
 
     else if (*type == compound_text_atom
-#ifdef FEAT_MBYTE
 	    || *type == utf8_atom
-#endif
-	    || (
-#ifdef FEAT_MBYTE
-		enc_dbcs != 0 &&
-#endif
-		*type == text_atom))
+	    || (enc_dbcs != 0 && *type == text_atom))
     {
 	XTextProperty	text_prop;
 	int		n_text = 0;
@@ -2241,7 +2181,7 @@
 	text_prop.encoding = *type;
 	text_prop.format = *format;
 	text_prop.nitems = len;
-#if defined(FEAT_MBYTE) && defined(X_HAVE_UTF8_STRING)
+#if defined(X_HAVE_UTF8_STRING)
 	if (*type == utf8_atom)
 	    status = Xutf8TextPropertyToTextList(X_DISPLAY, &text_prop,
 							 &text_list, &n_text);
@@ -2261,9 +2201,7 @@
 
     if (text_list != NULL)
 	XFreeStringList(text_list);
-#ifdef FEAT_MBYTE
     vim_free(tmpbuf);
-#endif
     XtFree((char *)value);
     *(int *)success = TRUE;
 }
@@ -2281,28 +2219,17 @@
     time_t	start_time;
     int		timed_out = FALSE;
 
-    for (i =
-#ifdef FEAT_MBYTE
-	    0
-#else
-	    1
-#endif
-	    ; i < 6; i++)
+    for (i = 0; i < 6; i++)
     {
 	switch (i)
 	{
-#ifdef FEAT_MBYTE
 	    case 0:  type = vimenc_atom;	break;
-#endif
 	    case 1:  type = vim_atom;		break;
-#ifdef FEAT_MBYTE
 	    case 2:  type = utf8_atom;		break;
-#endif
 	    case 3:  type = compound_text_atom; break;
 	    case 4:  type = text_atom;		break;
 	    default: type = XA_STRING;
 	}
-#ifdef FEAT_MBYTE
 	if (type == utf8_atom
 # if defined(X_HAVE_UTF8_STRING)
 		&& !enc_utf8
@@ -2311,7 +2238,6 @@
 	    /* Only request utf-8 when 'encoding' is utf8 and
 	     * Xutf8TextPropertyToTextList is available. */
 	    continue;
-#endif
 	success = MAYBE;
 	XtGetSelectionValue(myShell, cbd->sel_atom, type,
 	    clip_x11_request_selection_cb, (XtPointer)&success, CurrentTime);
@@ -2406,14 +2332,10 @@
 	*value = (XtPointer)array;
 	i = 0;
 	array[i++] = targets_atom;
-#ifdef FEAT_MBYTE
 	array[i++] = vimenc_atom;
-#endif
 	array[i++] = vim_atom;
-#ifdef FEAT_MBYTE
 	if (enc_utf8)
 	    array[i++] = utf8_atom;
-#endif
 	array[i++] = XA_STRING;
 	array[i++] = text_atom;
 	array[i++] = compound_text_atom;
@@ -2427,10 +2349,8 @@
     }
 
     if (       *target != XA_STRING
-#ifdef FEAT_MBYTE
 	    && *target != vimenc_atom
 	    && (*target != utf8_atom || !enc_utf8)
-#endif
 	    && *target != vim_atom
 	    && *target != text_atom
 	    && *target != compound_text_atom)
@@ -2445,11 +2365,9 @@
     if (*target == vim_atom)
 	(*length)++;
 
-#ifdef FEAT_MBYTE
     /* Our own format with encoding: motion 'encoding' NUL text */
     if (*target == vimenc_atom)
 	*length += STRLEN(p_enc) + 2;
-#endif
 
     if (save_length < *length || save_length / 2 >= *length)
 	*value = XtRealloc((char *)save_result, (Cardinal)*length + 1);
@@ -2463,11 +2381,7 @@
     save_result = (char_u *)*value;
     save_length = *length;
 
-    if (*target == XA_STRING
-#ifdef FEAT_MBYTE
-	    || (*target == utf8_atom && enc_utf8)
-#endif
-	    )
+    if (*target == XA_STRING || (*target == utf8_atom && enc_utf8))
     {
 	mch_memmove(save_result, string, (size_t)(*length));
 	*type = *target;
@@ -2495,7 +2409,6 @@
 	save_result = (char_u *)*value;
 	save_length = *length;
     }
-#ifdef FEAT_MBYTE
     else if (*target == vimenc_atom)
     {
 	int l = STRLEN(p_enc);
@@ -2505,7 +2418,6 @@
 	mch_memmove(save_result + l + 2, string, (size_t)(*length - l - 2));
 	*type = vimenc_atom;
     }
-#endif
     else
     {
 	save_result[0] = motion_type;
@@ -2599,7 +2511,6 @@
 
     if (nbytes > 0)
     {
-#ifdef FEAT_MBYTE
 	int  done = FALSE;
 
 	/* CUT_BUFFER0 is supposed to be always latin1.  Convert to 'enc' when
@@ -2625,7 +2536,6 @@
 	    }
 	}
 	if (!done)  /* use the text without conversion */
-#endif
 	    clip_yank_selection(MCHAR, buffer, (long)nbytes, cbd);
 	XFree((void *)buffer);
 	if (p_verbose > 0)
diff --git a/src/version.c b/src/version.c
index 79778cd..7898c1a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -459,11 +459,7 @@
 	"+multi_byte_ime",
 # endif
 #else
-# ifdef FEAT_MBYTE
 	"+multi_byte",
-# else
-	"-multi_byte",
-# endif
 #endif
 #ifdef FEAT_MULTI_LANG
 	"+multi_lang",
@@ -792,6 +788,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    810,
+/**/
     809,
 /**/
     808,
@@ -3052,14 +3050,12 @@
 	for (l = 0; p[l] != NUL
 			 && (l == 0 || (p[l] != '<' && p[l - 1] != '>')); ++l)
 	{
-#ifdef FEAT_MBYTE
 	    if (has_mbyte)
 	    {
 		clen += ptr2cells(p + l);
 		l += (*mb_ptr2len)(p + l) - 1;
 	    }
 	    else
-#endif
 		clen += byte2cells(p[l]);
 	}
 	screen_puts_len(p, l, row, col, *p == '<' ? HL_ATTR(HLF_8) : attr);
diff --git a/src/vim.h b/src/vim.h
index 39da8c9..37e9d5b 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -210,7 +210,7 @@
 #endif
 
 /* The Mac conversion stuff doesn't work under X11. */
-#if defined(FEAT_MBYTE) && defined(MACOS_X_DARWIN)
+#if defined(MACOS_X_DARWIN)
 # define MACOS_CONVERT
 #endif
 
@@ -431,16 +431,10 @@
  * bits.  u8char_T is only used for displaying, it could be 16 bits to save
  * memory.
  */
-#ifdef FEAT_MBYTE
-# ifdef UNICODE16
+#ifdef UNICODE16
 typedef unsigned short u8char_T;    /* short should be 16 bits */
-# else
-#  if VIM_SIZEOF_INT >= 4
-typedef unsigned int u8char_T;	    /* int is 32 bits */
-#  else
-typedef unsigned long u8char_T;	    /* long should be 32 bits or more */
-#  endif
-# endif
+#else
+typedef unsigned int u8char_T;	    /* int is 32 bits or more */
 #endif
 
 #ifndef UNIX		    /* For Unix this is included in os_unix.h */
@@ -1516,14 +1510,9 @@
 
 #define DIALOG_MSG_SIZE 1000	/* buffer size for dialog_msg() */
 
-#ifdef FEAT_MBYTE
-# define MSG_BUF_LEN 480	/* length of buffer for small messages */
-# define MSG_BUF_CLEN  (MSG_BUF_LEN / 6)    /* cell length (worst case: utf-8
+#define MSG_BUF_LEN 480	/* length of buffer for small messages */
+#define MSG_BUF_CLEN  (MSG_BUF_LEN / 6)    /* cell length (worst case: utf-8
 					       takes 6 bytes for one cell) */
-#else
-# define MSG_BUF_LEN 80		/* length of buffer for small messages */
-# define MSG_BUF_CLEN  MSG_BUF_LEN	    /* cell length */
-#endif
 
 #define FOLD_TEXT_LEN  51	/* buffer size for get_foldtext() */
 
@@ -1609,7 +1598,6 @@
 # endif
 #endif
 
-#ifdef FEAT_MBYTE
 /* We need to call mb_stricmp() even when we aren't dealing with a multi-byte
  * encoding because mb_stricmp() takes care of all ascii and non-ascii
  * encodings, including characters with umlauts in latin1, etc., while
@@ -1618,10 +1606,6 @@
 
 # define MB_STRICMP(d, s)	mb_strnicmp((char_u *)(d), (char_u *)(s), (int)MAXCOL)
 # define MB_STRNICMP(d, s, n)	mb_strnicmp((char_u *)(d), (char_u *)(s), (int)(n))
-#else
-# define MB_STRICMP(d, s)	STRICMP((d), (s))
-# define MB_STRNICMP(d, s, n)	STRNICMP((d), (s), (n))
-#endif
 
 #define STRCAT(d, s)	    strcat((char *)(d), (char *)(s))
 #define STRNCAT(d, s, n)    strncat((char *)(d), (char *)(s), (size_t)(n))
@@ -1766,16 +1750,12 @@
 # endif
 #endif
 
-#ifdef FEAT_MBYTE
-# define MAX_MCO	6	/* maximum value for 'maxcombine' */
+#define MAX_MCO	6	/* maximum value for 'maxcombine' */
 
 /* Maximum number of bytes in a multi-byte character.  It can be one 32-bit
  * character of up to 6 bytes, or one 16-bit character of up to three bytes
  * plus six following composing characters of three bytes each. */
-# define MB_MAXBYTES	21
-#else
-# define MB_MAXBYTES	1
-#endif
+#define MB_MAXBYTES	21
 
 #if (defined(FEAT_PROFILE) || defined(FEAT_RELTIME)) && !defined(PROTO)
 # ifdef WIN3264
@@ -2128,7 +2108,7 @@
 # define USE_MCH_ERRMSG
 #endif
 
-# if defined(FEAT_MBYTE) && defined(FEAT_EVAL) \
+# if defined(FEAT_EVAL) \
 	&& (!defined(FEAT_GUI_W32) \
 	     || !(defined(FEAT_MBYTE_IME) || defined(GLOBAL_IME))) \
 	&& !(defined(FEAT_GUI_MAC) && defined(MACOS_CONVERT))
@@ -2139,20 +2119,15 @@
 # define IME_WITHOUT_XIM
 #endif
 
-#if defined(FEAT_MBYTE) && (defined(FEAT_XIM) \
+#if defined(FEAT_XIM) \
 	|| defined(IME_WITHOUT_XIM) \
 	|| (defined(FEAT_GUI_W32) \
 	    && (defined(FEAT_MBYTE_IME) || defined(GLOBAL_IME))) \
-	|| defined(FEAT_GUI_MAC))
+	|| defined(FEAT_GUI_MAC)
 /* im_set_active() is available */
 # define HAVE_INPUT_METHOD
 #endif
 
-#ifndef FEAT_MBYTE
-# define after_pathsep(b, p)	vim_ispathsep(*((p) - 1))
-# define transchar_byte(c)	transchar(c)
-#endif
-
 #ifndef FEAT_LINEBREAK
 /* Without the 'numberwidth' option line numbers are always 7 chars. */
 # define number_width(x) 7
@@ -2160,7 +2135,7 @@
 
 /* This must come after including proto.h.
  * For VMS this is defined in macros.h. */
-#if !(defined(FEAT_MBYTE) && defined(WIN3264)) && !defined(VMS)
+#if !defined(WIN3264) && !defined(VMS)
 # define mch_open(n, m, p)	open((n), (m), (p))
 # define mch_fopen(n, p)	fopen((n), (p))
 #endif
@@ -2236,57 +2211,49 @@
 # define vim_realloc(ptr, size)  realloc((ptr), (size))
 #endif
 
-#ifdef FEAT_MBYTE
 /*
  * Return byte length of character that starts with byte "b".
  * Returns 1 for a single-byte character.
  * MB_BYTE2LEN_CHECK() can be used to count a special key as one byte.
  * Don't call MB_BYTE2LEN(b) with b < 0 or b > 255!
  */
-# define MB_BYTE2LEN(b)		mb_bytelen_tab[b]
-# define MB_BYTE2LEN_CHECK(b)	(((b) < 0 || (b) > 255) ? 1 : mb_bytelen_tab[b])
-#endif
+#define MB_BYTE2LEN(b)		mb_bytelen_tab[b]
+#define MB_BYTE2LEN_CHECK(b)	(((b) < 0 || (b) > 255) ? 1 : mb_bytelen_tab[b])
 
-#if defined(FEAT_MBYTE) || defined(FEAT_POSTSCRIPT)
 /* properties used in enc_canon_table[] (first three mutually exclusive) */
-# define ENC_8BIT	0x01
-# define ENC_DBCS	0x02
-# define ENC_UNICODE	0x04
+#define ENC_8BIT	0x01
+#define ENC_DBCS	0x02
+#define ENC_UNICODE	0x04
 
-# define ENC_ENDIAN_B	0x10	    /* Unicode: Big endian */
-# define ENC_ENDIAN_L	0x20	    /* Unicode: Little endian */
+#define ENC_ENDIAN_B	0x10	    /* Unicode: Big endian */
+#define ENC_ENDIAN_L	0x20	    /* Unicode: Little endian */
 
-# define ENC_2BYTE	0x40	    /* Unicode: UCS-2 */
-# define ENC_4BYTE	0x80	    /* Unicode: UCS-4 */
-# define ENC_2WORD	0x100	    /* Unicode: UTF-16 */
+#define ENC_2BYTE	0x40	    /* Unicode: UCS-2 */
+#define ENC_4BYTE	0x80	    /* Unicode: UCS-4 */
+#define ENC_2WORD	0x100	    /* Unicode: UTF-16 */
 
-# define ENC_LATIN1	0x200	    /* Latin1 */
-# define ENC_LATIN9	0x400	    /* Latin9 */
-# define ENC_MACROMAN	0x800	    /* Mac Roman (not Macro Man! :-) */
-#endif
+#define ENC_LATIN1	0x200	    /* Latin1 */
+#define ENC_LATIN9	0x400	    /* Latin9 */
+#define ENC_MACROMAN	0x800	    /* Mac Roman (not Macro Man! :-) */
 
-#ifdef FEAT_MBYTE
-# ifdef USE_ICONV
-#  ifndef EILSEQ
-#   define EILSEQ 123
-#  endif
-#  ifdef DYNAMIC_ICONV
-/* On Win32 iconv.dll is dynamically loaded. */
-#   define ICONV_ERRNO (*iconv_errno())
-#   define ICONV_E2BIG  7
-#   define ICONV_EINVAL 22
-#   define ICONV_EILSEQ 42
-#  else
-#   define ICONV_ERRNO errno
-#   define ICONV_E2BIG  E2BIG
-#   define ICONV_EINVAL EINVAL
-#   define ICONV_EILSEQ EILSEQ
-#  endif
+#ifdef USE_ICONV
+# ifndef EILSEQ
+#  define EILSEQ 123
 # endif
-
+# ifdef DYNAMIC_ICONV
+/* On Win32 iconv.dll is dynamically loaded. */
+#  define ICONV_ERRNO (*iconv_errno())
+#  define ICONV_E2BIG  7
+#  define ICONV_EINVAL 22
+#  define ICONV_EILSEQ 42
+# else
+#  define ICONV_ERRNO errno
+#  define ICONV_E2BIG  E2BIG
+#  define ICONV_EINVAL EINVAL
+#  define ICONV_EILSEQ EILSEQ
+# endif
 #endif
 
-
 #define SIGN_BYTE 1	    /* byte value used where sign is displayed;
 			       attribute value is sign type */
 
diff --git a/src/winclip.c b/src/winclip.c
index 4bafa8d..0285dc5 100644
--- a/src/winclip.c
+++ b/src/winclip.c
@@ -44,7 +44,6 @@
 typedef int UINT;
 #endif
 
-#if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Convert an UTF-8 string to UTF-16.
  * "instr[inlen]" is the input.  "inlen" is in bytes.
@@ -179,7 +178,6 @@
     }
 }
 
-#endif /* FEAT_MBYTE */
 
 #ifdef FEAT_CLIPBOARD
 /*
@@ -301,12 +299,10 @@
     VimClipType_t	metadata = { -1, -1, -1, -1 };
     HGLOBAL		hMem = NULL;
     char_u		*str = NULL;
-#if defined(FEAT_MBYTE) && defined(WIN3264)
+#if defined(WIN3264)
     char_u		*to_free = NULL;
 #endif
-#ifdef FEAT_MBYTE
     HGLOBAL		rawh = NULL;
-#endif
     int			str_size = 0;
     int			maxlen;
     size_t		n;
@@ -339,7 +335,6 @@
 	}
     }
 
-#ifdef FEAT_MBYTE
     /* Check for Vim's raw clipboard format first.  This is used without
      * conversion, but only if 'encoding' matches. */
     if (IsClipboardFormatAvailable(cbd->format_raw)
@@ -366,79 +361,75 @@
     }
     if (str == NULL)
     {
-#endif
-
-#if defined(FEAT_MBYTE) && defined(WIN3264)
-    /* Try to get the clipboard in Unicode if it's not an empty string. */
-    if (IsClipboardFormatAvailable(CF_UNICODETEXT) && metadata.ucslen != 0)
-    {
-	HGLOBAL hMemW;
-
-	if ((hMemW = GetClipboardData(CF_UNICODETEXT)) != NULL)
+#if defined(WIN3264)
+	/* Try to get the clipboard in Unicode if it's not an empty string. */
+	if (IsClipboardFormatAvailable(CF_UNICODETEXT) && metadata.ucslen != 0)
 	{
-	    WCHAR *hMemWstr = (WCHAR *)GlobalLock(hMemW);
+	    HGLOBAL hMemW;
 
-	    /* Use the length of our metadata if possible, but limit it to the
-	     * GlobalSize() for safety. */
-	    maxlen = (int)(GlobalSize(hMemW) / sizeof(WCHAR));
-	    if (metadata.ucslen >= 0)
+	    if ((hMemW = GetClipboardData(CF_UNICODETEXT)) != NULL)
 	    {
-		if (metadata.ucslen > maxlen)
-		    str_size = maxlen;
+		WCHAR *hMemWstr = (WCHAR *)GlobalLock(hMemW);
+
+		/* Use the length of our metadata if possible, but limit it to
+		 * the GlobalSize() for safety. */
+		maxlen = (int)(GlobalSize(hMemW) / sizeof(WCHAR));
+		if (metadata.ucslen >= 0)
+		{
+		    if (metadata.ucslen > maxlen)
+			str_size = maxlen;
+		    else
+			str_size = metadata.ucslen;
+		}
 		else
-		    str_size = metadata.ucslen;
+		{
+		    for (str_size = 0; str_size < maxlen; ++str_size)
+			if (hMemWstr[str_size] == NUL)
+			    break;
+		}
+		to_free = str = utf16_to_enc((short_u *)hMemWstr, &str_size);
+		GlobalUnlock(hMemW);
 	    }
-	    else
+	}
+	else
+#endif
+	    /* Get the clipboard in the Active codepage. */
+	    if (IsClipboardFormatAvailable(CF_TEXT))
+	{
+	    if ((hMem = GetClipboardData(CF_TEXT)) != NULL)
 	    {
-		for (str_size = 0; str_size < maxlen; ++str_size)
-		    if (hMemWstr[str_size] == NUL)
-			break;
+		str = (char_u *)GlobalLock(hMem);
+
+		/* The length is either what our metadata says or the strlen().
+		 * But limit it to the GlobalSize() for safety. */
+		maxlen = (int)GlobalSize(hMem);
+		if (metadata.txtlen >= 0)
+		{
+		    if (metadata.txtlen > maxlen)
+			str_size = maxlen;
+		    else
+			str_size = metadata.txtlen;
+		}
+		else
+		{
+		    for (str_size = 0; str_size < maxlen; ++str_size)
+			if (str[str_size] == NUL)
+			    break;
+		}
+
+#if defined(WIN3264)
+		/* The text is in the active codepage.  Convert to
+		 * 'encoding', going through UTF-16. */
+		acp_to_enc(str, str_size, &to_free, &maxlen);
+		if (to_free != NULL)
+		{
+		    str_size = maxlen;
+		    str = to_free;
+		}
+#endif
 	    }
-	    to_free = str = utf16_to_enc((short_u *)hMemWstr, &str_size);
-	    GlobalUnlock(hMemW);
 	}
     }
-    else
-#endif
-    /* Get the clipboard in the Active codepage. */
-    if (IsClipboardFormatAvailable(CF_TEXT))
-    {
-	if ((hMem = GetClipboardData(CF_TEXT)) != NULL)
-	{
-	    str = (char_u *)GlobalLock(hMem);
-
-	    /* The length is either what our metadata says or the strlen().
-	     * But limit it to the GlobalSize() for safety. */
-	    maxlen = (int)GlobalSize(hMem);
-	    if (metadata.txtlen >= 0)
-	    {
-		if (metadata.txtlen > maxlen)
-		    str_size = maxlen;
-		else
-		    str_size = metadata.txtlen;
-	    }
-	    else
-	    {
-		for (str_size = 0; str_size < maxlen; ++str_size)
-		    if (str[str_size] == NUL)
-			break;
-	    }
-
-# if defined(FEAT_MBYTE) && defined(WIN3264)
-	    /* The text is in the active codepage.  Convert to 'encoding',
-	     * going through UTF-16. */
-	    acp_to_enc(str, str_size, &to_free, &maxlen);
-	    if (to_free != NULL)
-	    {
-		str_size = maxlen;
-		str = to_free;
-	    }
-# endif
-	}
-    }
-#ifdef FEAT_MBYTE
-    }
-#endif
 
     if (str != NULL && *str != NUL)
     {
@@ -460,12 +451,10 @@
     /* unlock the global object */
     if (hMem != NULL)
 	GlobalUnlock(hMem);
-#ifdef FEAT_MBYTE
     if (rawh != NULL)
 	GlobalUnlock(rawh);
-#endif
     CloseClipboard();
-#if defined(FEAT_MBYTE) && defined(WIN3264)
+#if defined(WIN3264)
     vim_free(to_free);
 #endif
 }
@@ -482,7 +471,7 @@
     HGLOBAL		hMemRaw = NULL;
     HGLOBAL		hMem = NULL;
     HGLOBAL		hMemVim = NULL;
-# if defined(FEAT_MBYTE) && defined(WIN3264)
+# if defined(WIN3264)
     HGLOBAL		hMemW = NULL;
 # endif
 
@@ -499,7 +488,6 @@
     metadata.ucslen = 0;
     metadata.rawlen = 0;
 
-#ifdef FEAT_MBYTE
     /* Always set the raw bytes: 'encoding', NUL and the text.  This is used
      * when copy/paste from/to Vim with the same 'encoding', so that illegal
      * bytes can also be copied and no conversion is needed. */
@@ -519,9 +507,8 @@
 	else
 	    metadata.rawlen = 0;
     }
-#endif
 
-# if defined(FEAT_MBYTE) && defined(WIN3264)
+# if defined(WIN3264)
     {
 	WCHAR		*out;
 	int		len = metadata.txtlen;
@@ -603,7 +590,7 @@
 	{
 	    SetClipboardData(cbd->format, hMemVim);
 	    hMemVim = 0;
-# if defined(FEAT_MBYTE) && defined(WIN3264)
+# if defined(WIN3264)
 	    if (hMemW != NULL)
 	    {
 		if (SetClipboardData(CF_UNICODETEXT, hMemW) != NULL)
@@ -624,7 +611,7 @@
 	GlobalFree(hMemRaw);
     if (hMem)
 	GlobalFree(hMem);
-# if defined(FEAT_MBYTE) && defined(WIN3264)
+# if defined(WIN3264)
     if (hMemW)
 	GlobalFree(hMemW);
 # endif
@@ -634,7 +621,6 @@
 
 #endif /* FEAT_CLIPBOARD */
 
-#if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Note: the following two functions are only guaranteed to work when using
  * valid MS-Windows codepages or when iconv() is available.
@@ -759,9 +745,8 @@
 
     return enc_str;
 }
-#endif /* FEAT_MBYTE */
 
-#if (defined(FEAT_MBYTE) && defined(WIN3264)) || defined(PROTO)
+#if defined(WIN3264) || defined(PROTO)
 /*
  * Convert from the active codepage to 'encoding'.
  * Input is "str[str_size]".
diff --git a/src/window.c b/src/window.c
index 792288f..58a21e8 100644
--- a/src/window.c
+++ b/src/window.c
@@ -6180,12 +6180,9 @@
      */
     while (ptr > line)
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte && (len = (*mb_head_off)(line, ptr - 1)) > 0)
 	    ptr -= len + 1;
-	else
-#endif
-	if (vim_isfilec(ptr[-1])
+	else if (vim_isfilec(ptr[-1])
 		|| ((options & FNAME_HYP) && path_is_url(ptr - 1)))
 	    --ptr;
 	else
@@ -6214,11 +6211,9 @@
 	if (ptr[len] == '\\')
 	    /* Skip over the "\" in "\ ". */
 	    ++len;
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	    len += (*mb_ptr2len)(ptr + len);
 	else
-#endif
 	    ++len;
     }
 
@@ -6829,7 +6824,7 @@
     m->match.regprog = regprog;
     m->match.rmm_ic = FALSE;
     m->match.rmm_maxcol = 0;
-# if defined(FEAT_CONCEAL) && defined(FEAT_MBYTE)
+# if defined(FEAT_CONCEAL)
     m->conceal_char = 0;
     if (conceal_char != NULL)
 	m->conceal_char = (*mb_ptr2char)(conceal_char);