diff --git a/src/eval.c b/src/eval.c
index 7abb62b..b3a3b41 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -14042,15 +14042,15 @@
 	"tcl",
 # endif
 #endif
+#ifdef FEAT_TERMGUICOLORS
+	"termguicolors",
+#endif
 #ifdef TERMINFO
 	"terminfo",
 #endif
 #ifdef FEAT_TERMRESPONSE
 	"termresponse",
 #endif
-#ifdef FEAT_TERMTRUECOLOR
-	"termtruecolor",
-#endif
 #ifdef FEAT_TEXTOBJ
 	"textobjects",
 #endif
@@ -20019,7 +20019,7 @@
     }
     else
     {
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 	if (USE_24BIT)
 	    modec = 'g';
 	else
diff --git a/src/feature.h b/src/feature.h
index d3d768e..54f665f 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -815,10 +815,10 @@
 #endif
 
 /*
- * +termtruecolor	'guicolor' option.
+ * +termguicolors	'termguicolors' option.
  */
 #if (defined(FEAT_BIG) && defined(FEAT_SYN_HL)) && !defined(ALWAYS_USE_GUI)
-# define FEAT_TERMTRUECOLOR
+# define FEAT_TERMGUICOLORS
 #endif
 
 /* Mac specific thing: Codewarrior interface. */
diff --git a/src/globals.h b/src/globals.h
index 8cc9bed..5010cd4 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -369,7 +369,7 @@
 EXTERN int	cterm_normal_fg_color INIT(= 0);
 EXTERN int	cterm_normal_fg_bold INIT(= 0);
 EXTERN int	cterm_normal_bg_color INIT(= 0);
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 EXTERN long_u	cterm_normal_fg_gui_color INIT(= INVALCOLOR);
 EXTERN long_u	cterm_normal_bg_gui_color INIT(= INVALCOLOR);
 #endif
diff --git a/src/hardcopy.c b/src/hardcopy.c
index aaa2010..55b3b15 100644
--- a/src/hardcopy.c
+++ b/src/hardcopy.c
@@ -307,7 +307,7 @@
     pattr->underline = (highlight_has_attr(hl_id, HL_UNDERLINE, modec) != NULL);
     pattr->undercurl = (highlight_has_attr(hl_id, HL_UNDERCURL, modec) != NULL);
 
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
     if (USE_24BIT)
     {
 	bg_color = highlight_gui_color_rgb(hl_id, FALSE);
diff --git a/src/option.c b/src/option.c
index da02864..d048cec 100644
--- a/src/option.c
+++ b/src/option.c
@@ -1305,15 +1305,6 @@
 			    {(char_u *)NULL, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
-    {"guicolors",   "gcol", P_BOOL|P_VI_DEF|P_VIM|P_RCLR,
-#ifdef FEAT_TERMTRUECOLOR
-			    (char_u *)&p_guicolors, PV_NONE,
-			    {(char_u *)FALSE, (char_u *)FALSE}
-#else
-			    (char_u*)NULL, PV_NONE,
-			    {(char_u *)FALSE, (char_u *)FALSE}
-#endif
-			    SCRIPTID_INIT},
     {"guicursor",    "gcr", P_STRING|P_VI_DEF|P_ONECOMMA|P_NODUP,
 #ifdef CURSOR_SHAPE
 			    (char_u *)&p_guicursor, PV_NONE,
@@ -2625,6 +2616,15 @@
 			    {(char_u *)0L, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
+    {"termguicolors", "tgc", P_BOOL|P_VI_DEF|P_VIM|P_RCLR,
+#ifdef FEAT_TERMGUICOLORS
+			    (char_u *)&p_tgc, PV_NONE,
+			    {(char_u *)FALSE, (char_u *)FALSE}
+#else
+			    (char_u*)NULL, PV_NONE,
+			    {(char_u *)FALSE, (char_u *)FALSE}
+#endif
+			    SCRIPTID_INIT},
     {"terse",	    NULL,   P_BOOL|P_VI_DEF,
 			    (char_u *)&p_terse, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCRIPTID_INIT},
@@ -8364,9 +8364,9 @@
 
 #endif
 
-#ifdef FEAT_TERMTRUECOLOR
-    /* 'guicolors' */
-    else if ((int *)varp == &p_guicolors)
+#ifdef FEAT_TERMGUICOLORS
+    /* 'termguicolors' */
+    else if ((int *)varp == &p_tgc)
     {
 # ifdef FEAT_GUI
 	if (!gui.in_use && !gui.starting)
diff --git a/src/option.h b/src/option.h
index 60889ab..6fba8b8 100644
--- a/src/option.h
+++ b/src/option.h
@@ -527,9 +527,6 @@
 EXTERN char_u	*p_header;	/* 'printheader' */
 #endif
 EXTERN int	p_prompt;	/* 'prompt' */
-#ifdef FEAT_TERMTRUECOLOR
-EXTERN int	p_guicolors;	/* 'guicolors' */
-#endif
 #ifdef FEAT_GUI
 EXTERN char_u	*p_guifont;	/* 'guifont' */
 # ifdef FEAT_XFONTSET
@@ -843,6 +840,9 @@
 #ifdef FEAT_MBYTE
 EXTERN char_u	*p_tenc;	/* 'termencoding' */
 #endif
+#ifdef FEAT_TERMGUICOLORS
+EXTERN int	p_tgc;		/* 'termguicolors' */
+#endif
 EXTERN int	p_terse;	/* 'terse' */
 EXTERN int	p_ta;		/* 'textauto' */
 EXTERN int	p_to;		/* 'tildeop' */
diff --git a/src/proto/term.pro b/src/proto/term.pro
index 3984515..93c6cb0 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -1,7 +1,7 @@
 /* term.c */
-guicolor_T termtrue_mch_get_color(char_u *name);
-guicolor_T termtrue_get_color(char_u *name);
-long_u termtrue_mch_get_rgb(guicolor_T color);
+guicolor_T termgui_mch_get_color(char_u *name);
+guicolor_T termgui_get_color(char_u *name);
+long_u termgui_mch_get_rgb(guicolor_T color);
 int set_termname(char_u *term);
 void set_mouse_termcode(int n, char_u *s);
 void del_mouse_termcode(int n);
diff --git a/src/screen.c b/src/screen.c
index ee348e9..a72bffa 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -7840,12 +7840,12 @@
 	    if ((attr & HL_BOLD) && T_MD != NULL)	/* bold */
 		out_str(T_MD);
 	    else if (aep != NULL && cterm_normal_fg_bold &&
-#ifdef FEAT_TERMTRUECOLOR
-			(p_guicolors ?
+#ifdef FEAT_TERMGUICOLORS
+			(p_tgc ?
 			    (aep->ae_u.cterm.fg_rgb != (long_u)INVALCOLOR):
 #endif
 			    (t_colors > 1 && aep->ae_u.cterm.fg_color)
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 			)
 #endif
 		    )
@@ -7868,8 +7868,8 @@
 	     */
 	    if (aep != NULL)
 	    {
-#ifdef FEAT_TERMTRUECOLOR
-		if (p_guicolors)
+#ifdef FEAT_TERMGUICOLORS
+		if (p_tgc)
 		{
 		    if (aep->ae_u.cterm.fg_rgb != (long_u)INVALCOLOR)
 			term_fg_rgb_color(aep->ae_u.cterm.fg_rgb);
@@ -7931,13 +7931,13 @@
 		     */
 		    aep = syn_cterm_attr2entry(screen_attr);
 		    if (aep != NULL &&
-#ifdef FEAT_TERMTRUECOLOR
-			    (p_guicolors ?
+#ifdef FEAT_TERMGUICOLORS
+			    (p_tgc ?
 				(aep->ae_u.cterm.fg_rgb != (long_u)INVALCOLOR ||
 				 aep->ae_u.cterm.bg_rgb != (long_u)INVALCOLOR):
 #endif
 				(aep->ae_u.cterm.fg_color || aep->ae_u.cterm.bg_color)
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 			    )
 #endif
 			)
@@ -7988,8 +7988,8 @@
 	    if (do_ME || (screen_attr & (HL_BOLD | HL_INVERSE)))
 		out_str(T_ME);
 
-#ifdef FEAT_TERMTRUECOLOR
-	    if (p_guicolors)
+#ifdef FEAT_TERMGUICOLORS
+	    if (p_tgc)
 	    {
 		if (cterm_normal_fg_gui_color != (long_u)INVALCOLOR)
 		    term_fg_rgb_color(cterm_normal_fg_gui_color);
@@ -8025,8 +8025,8 @@
     if (IS_CTERM)
     {
 	/* set Normal cterm colors */
-#ifdef FEAT_TERMTRUECOLOR
-	if (p_guicolors ?
+#ifdef FEAT_TERMGUICOLORS
+	if (p_tgc ?
 		(cterm_normal_fg_gui_color != (long_u)INVALCOLOR
 		 || cterm_normal_bg_gui_color != (long_u)INVALCOLOR):
 		(cterm_normal_fg_color > 0 || cterm_normal_bg_color > 0))
@@ -8959,8 +8959,8 @@
 #ifdef FEAT_GUI
 		|| gui.in_use
 #endif
-#ifdef FEAT_TERMTRUECOLOR
-		|| (p_guicolors && cterm_normal_bg_gui_color != (long_u)INVALCOLOR)
+#ifdef FEAT_TERMGUICOLORS
+		|| (p_tgc && cterm_normal_bg_gui_color != (long_u)INVALCOLOR)
 #endif
 		|| cterm_normal_bg_color == 0 || *T_UT != NUL));
 }
@@ -10293,8 +10293,8 @@
 #ifdef FEAT_GUI
 					    && !gui.in_use
 #endif
-#ifdef FEAT_TERMTRUECOLOR
-					    && !p_guicolors
+#ifdef FEAT_TERMGUICOLORS
+					    && !p_tgc
 #endif
 					    );
 
diff --git a/src/structs.h b/src/structs.h
index 1775256..50901ac 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -85,7 +85,7 @@
 #  include <X11/Intrinsic.h>
 # endif
 # define guicolor_T long_u		/* avoid error in prototypes and 
-					 * make FEAT_TERMTRUECOLOR work */
+					 * make FEAT_TERMGUICOLORS work */
 # define INVALCOLOR ((guicolor_T)0x1ffffff)
 #endif
 
@@ -913,7 +913,7 @@
 	    /* These colors need to be > 8 bits to hold 256. */
 	    short_u	    fg_color;	/* foreground color number */
 	    short_u	    bg_color;	/* background color number */
-# ifdef FEAT_TERMTRUECOLOR
+# ifdef FEAT_TERMGUICOLORS
 	    long_u	    fg_rgb;	/* foreground color RGB */
 	    long_u	    bg_rgb;	/* background color RGB */
 # endif
diff --git a/src/syntax.c b/src/syntax.c
index ea4e74c..7d4e7b1 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -34,7 +34,7 @@
     int		sg_cterm_bg;	/* terminal bg color number + 1 */
     int		sg_cterm_attr;	/* Screen attr for color term mode */
 /* for when using the GUI */
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
     guicolor_T	sg_gui_fg;	/* GUI foreground color handle */
     guicolor_T	sg_gui_bg;	/* GUI background color handle */
 #endif
@@ -99,7 +99,7 @@
 static int hl_has_settings(int idx, int check_link);
 static void highlight_clear(int idx);
 
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 static void gui_do_one_color(int idx, int do_menu, int do_tooltip);
 static guicolor_T color_name2handle(char_u *name);
 #endif
@@ -7337,7 +7337,7 @@
 	    for (idx = 0; idx < highlight_ga.ga_len; ++idx)
 		highlight_clear(idx);
 	    init_highlight(TRUE, TRUE);
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 	    if (USE_24BIT)
 		highlight_gui_started();
 #endif
@@ -7792,14 +7792,14 @@
 		if (!init)
 		    HL_TABLE()[idx].sg_set |= SG_GUI;
 
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 		/* In GUI guifg colors are only used when recognized */
 		i = color_name2handle(arg);
 		if (i != INVALCOLOR || STRCMP(arg, "NONE") == 0
 #  ifdef FEAT_GUI
 			|| !(USE_24BIT)
 #  else
-			|| !p_guicolors
+			|| !p_tgc
 #  endif
 		   )
 		{
@@ -7810,7 +7810,7 @@
 			HL_TABLE()[idx].sg_gui_fg_name = vim_strsave(arg);
 		    else
 			HL_TABLE()[idx].sg_gui_fg_name = NULL;
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 #  ifdef FEAT_GUI_X11
 		    if (is_menu_group)
 			gui.menu_fg_pixel = i;
@@ -7835,7 +7835,7 @@
 		if (!init)
 		    HL_TABLE()[idx].sg_set |= SG_GUI;
 
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 		/* In GUI guifg colors are only used when recognized */
 		i = color_name2handle(arg);
 		if (i != INVALCOLOR || STRCMP(arg, "NONE") == 0 || !USE_24BIT)
@@ -7847,7 +7847,7 @@
 			HL_TABLE()[idx].sg_gui_bg_name = vim_strsave(arg);
 		    else
 			HL_TABLE()[idx].sg_gui_bg_name = NULL;
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 #  ifdef FEAT_GUI_X11
 		    if (is_menu_group)
 			gui.menu_bg_pixel = i;
@@ -8008,7 +8008,7 @@
 	     * and/or "fg", which have been changed now.
 	     */
 #endif
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 	    if (USE_24BIT)
 		highlight_gui_started();
 #endif
@@ -8080,7 +8080,7 @@
     cterm_normal_fg_color = 0;
     cterm_normal_fg_bold = 0;
     cterm_normal_bg_color = 0;
-# ifdef FEAT_TERMTRUECOLOR
+# ifdef FEAT_TERMGUICOLORS
     cterm_normal_fg_gui_color = INVALCOLOR;
     cterm_normal_bg_gui_color = INVALCOLOR;
 # endif
@@ -8134,7 +8134,7 @@
     vim_free(HL_TABLE()[idx].sg_gui_sp_name);
     HL_TABLE()[idx].sg_gui_sp_name = NULL;
 #endif
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
     HL_TABLE()[idx].sg_gui_fg = INVALCOLOR;
     HL_TABLE()[idx].sg_gui_bg = INVALCOLOR;
 #endif
@@ -8158,7 +8158,7 @@
 #endif
 }
 
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR) || defined(PROTO)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
 /*
  * Set the normal foreground and background colors according to the "Normal"
  * highlighting group.  For X11 also set "Menu", "Scrollbar", and
@@ -8168,7 +8168,7 @@
 set_normal_colors(void)
 {
 #ifdef FEAT_GUI
-# ifdef FEAT_TERMTRUECOLOR
+# ifdef FEAT_TERMGUICOLORS
     if (gui.in_use)
 # endif
     {
@@ -8210,7 +8210,7 @@
 # endif
     }
 #endif
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 # ifdef FEAT_GUI
     else
 # endif
@@ -8473,7 +8473,7 @@
 
 #endif /* FEAT_GUI */
 
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR) || defined(PROTO)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
 /*
  * Return the handle for a color name.
  * Returns INVALCOLOR when failed.
@@ -8486,31 +8486,31 @@
 
     if (STRICMP(name, "fg") == 0 || STRICMP(name, "foreground") == 0)
     {
-#if defined(FEAT_TERMTRUECOLOR) && defined(FEAT_GUI)
+#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
 	if (gui.in_use)
 #endif
 #ifdef FEAT_GUI
 	    return gui.norm_pixel;
 #endif
-#if defined(FEAT_TERMTRUECOLOR) && defined(FEAT_GUI)
+#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
 	else
 #endif
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 	    return cterm_normal_fg_gui_color;
 #endif
     }
     if (STRICMP(name, "bg") == 0 || STRICMP(name, "background") == 0)
     {
-#if defined(FEAT_TERMTRUECOLOR) && defined(FEAT_GUI)
+#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
 	if (gui.in_use)
 #endif
 #ifdef FEAT_GUI
 	    return gui.back_pixel;
 #endif
-#if defined(FEAT_TERMTRUECOLOR) && defined(FEAT_GUI)
+#if defined(FEAT_TERMGUICOLORS) && defined(FEAT_GUI)
 	else
 #endif
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 	    return cterm_normal_bg_gui_color;
 #endif
     }
@@ -8595,7 +8595,7 @@
 						  == taep->ae_u.cterm.fg_color
 			    && aep->ae_u.cterm.bg_color
 						  == taep->ae_u.cterm.bg_color
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 			    && aep->ae_u.cterm.fg_rgb
 						    == taep->ae_u.cterm.fg_rgb
 			    && aep->ae_u.cterm.bg_rgb
@@ -8667,7 +8667,7 @@
     {
 	taep->ae_u.cterm.fg_color = aep->ae_u.cterm.fg_color;
 	taep->ae_u.cterm.bg_color = aep->ae_u.cterm.bg_color;
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 	taep->ae_u.cterm.fg_rgb = aep->ae_u.cterm.fg_rgb;
 	taep->ae_u.cterm.bg_rgb = aep->ae_u.cterm.bg_rgb;
 #endif
@@ -8787,7 +8787,7 @@
 		    new_en.ae_u.cterm.fg_color = spell_aep->ae_u.cterm.fg_color;
 		if (spell_aep->ae_u.cterm.bg_color > 0)
 		    new_en.ae_u.cterm.bg_color = spell_aep->ae_u.cterm.bg_color;
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 		if (spell_aep->ae_u.cterm.fg_rgb != (long_u)INVALCOLOR)
 		    new_en.ae_u.cterm.fg_rgb = spell_aep->ae_u.cterm.fg_rgb;
 		if (spell_aep->ae_u.cterm.bg_rgb != (long_u)INVALCOLOR)
@@ -9056,7 +9056,7 @@
 	return NULL;
     if (modec == 'g')
     {
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 #  ifdef FEAT_GUI
 	/* return font name */
 	if (font)
@@ -9115,7 +9115,7 @@
 #endif
 
 #if (defined(FEAT_SYN_HL) \
-	    && (defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)) \
+	    && (defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)) \
 	&& defined(FEAT_PRINTER)) || defined(PROTO)
 /*
  * Return color name of highlight group "id" as RGB value.
@@ -9255,7 +9255,7 @@
      * highlighting attributes, need to allocate an attr number.
      */
     if (sgp->sg_cterm_fg == 0 && sgp->sg_cterm_bg == 0
-# ifdef FEAT_TERMTRUECOLOR
+# ifdef FEAT_TERMGUICOLORS
 	    && sgp->sg_gui_fg == INVALCOLOR
 	    && sgp->sg_gui_bg == INVALCOLOR
 # endif
@@ -9266,7 +9266,7 @@
 	at_en.ae_attr = sgp->sg_cterm;
 	at_en.ae_u.cterm.fg_color = sgp->sg_cterm_fg;
 	at_en.ae_u.cterm.bg_color = sgp->sg_cterm_bg;
-# ifdef FEAT_TERMTRUECOLOR
+# ifdef FEAT_TERMGUICOLORS
 	at_en.ae_u.cterm.fg_rgb = GUI_MCH_GET_RGB(sgp->sg_gui_fg);
 	at_en.ae_u.cterm.bg_rgb = GUI_MCH_GET_RGB(sgp->sg_gui_bg);
 # endif
@@ -9420,7 +9420,7 @@
     vim_memset(&(HL_TABLE()[highlight_ga.ga_len]), 0, sizeof(struct hl_group));
     HL_TABLE()[highlight_ga.ga_len].sg_name = name;
     HL_TABLE()[highlight_ga.ga_len].sg_name_u = vim_strsave_up(name);
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
     HL_TABLE()[highlight_ga.ga_len].sg_gui_bg = INVALCOLOR;
     HL_TABLE()[highlight_ga.ga_len].sg_gui_fg = INVALCOLOR;
 # ifdef FEAT_GUI
@@ -9518,7 +9518,7 @@
     return hl_id;
 }
 
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 /*
  * Call this function just after the GUI has started.
  * It finds the font and color handles for the highlighting groups.
@@ -9529,8 +9529,8 @@
     int	    idx;
 
     /* First get the colors from the "Normal" and "Menu" group, if set */
-# if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR)
-#  ifdef FEAT_TERMTRUECOLOR
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+#  ifdef FEAT_TERMGUICOLORS
     if (USE_24BIT)
 #  endif
 	set_normal_colors();
@@ -9551,7 +9551,7 @@
     int		didit = FALSE;
 
 # ifdef FEAT_GUI
-#  ifdef FEAT_TERMTRUECOLOR
+#  ifdef FEAT_TERMGUICOLORS
     if (gui.in_use)
 #  endif
 	if (HL_TABLE()[idx].sg_font_name != NULL)
diff --git a/src/term.c b/src/term.c
index 3c8c0fa..4af9aeb 100644
--- a/src/term.c
+++ b/src/term.c
@@ -77,7 +77,7 @@
 static struct builtin_term *find_builtin_term(char_u *name);
 static void parse_builtin_tcap(char_u *s);
 static void term_color(char_u *s, int n);
-#ifdef FEAT_TERMTRUECOLOR
+#ifdef FEAT_TERMGUICOLORS
 static void term_rgb_color(char_u *s, long_u rgb);
 #endif
 static void gather_termleader(void);
@@ -859,7 +859,7 @@
     {(int)KS_CRV,	IF_EB("\033[>c", ESC_STR "[>c")},
     {(int)KS_RBG,	IF_EB("\033]11;?\007", ESC_STR "]11;?\007")},
     {(int)KS_U7,	IF_EB("\033[6n", ESC_STR "[6n")},
-#  ifdef FEAT_TERMTRUECOLOR
+#  ifdef FEAT_TERMGUICOLORS
     /* These are printf strings, not terminal codes. */
     {(int)KS_8F,	IF_EB("\033[38;2;%lu;%lu;%lum", ESC_STR "[38;2;%lu;%lu;%lum")},
     {(int)KS_8B,	IF_EB("\033[48;2;%lu;%lu;%lum", ESC_STR "[48;2;%lu;%lu;%lum")},
@@ -1265,21 +1265,21 @@
 
 };	/* end of builtin_termcaps */
 
-#if defined(FEAT_TERMTRUECOLOR) || defined(PROTO)
+#if defined(FEAT_TERMGUICOLORS) || defined(PROTO)
     guicolor_T
-termtrue_mch_get_color(char_u *name)
+termgui_mch_get_color(char_u *name)
 {
     return gui_get_color_cmn(name);
 }
 
     guicolor_T
-termtrue_get_color(char_u *name)
+termgui_get_color(char_u *name)
 {
     guicolor_T	t;
 
     if (*name == NUL)
 	return INVALCOLOR;
-    t = termtrue_mch_get_color(name);
+    t = termgui_mch_get_color(name);
 
     if (t == INVALCOLOR)
 	EMSG2(_("E254: Cannot allocate color %s"), name);
@@ -1287,9 +1287,9 @@
 }
 
     long_u
-termtrue_mch_get_rgb(guicolor_T color)
+termgui_mch_get_rgb(guicolor_T color)
 {
-    return (long_u) color;
+    return (long_u)color;
 }
 #endif
 
@@ -2645,7 +2645,7 @@
 	OUT_STR(tgoto((char *)s, 0, n));
 }
 
-#if defined(FEAT_TERMTRUECOLOR) || defined(PROTO)
+#if defined(FEAT_TERMGUICOLORS) || defined(PROTO)
     void
 term_fg_rgb_color(long_u rgb)
 {
@@ -6053,7 +6053,7 @@
 }
 #endif
 
-#if defined(FEAT_GUI) || defined(FEAT_TERMTRUECOLOR) || defined(PROTO)
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS) || defined(PROTO)
     static int
 hex_digit(int c)
 {
diff --git a/src/version.c b/src/version.c
index 44f37a7..5a09447 100644
--- a/src/version.c
+++ b/src/version.c
@@ -602,6 +602,11 @@
 #else
 	"-tcl",
 #endif
+#ifdef FEAT_TERMGUICOLORS
+	"+termguicolors",
+#else
+	"-termguicolors",
+#endif
 #if defined(UNIX) || defined(__EMX__)
 /* only Unix (or OS/2 with EMX!) can have terminfo instead of termcap */
 # ifdef TERMINFO
@@ -621,11 +626,6 @@
 #else
 	"-termresponse",
 #endif
-#ifdef FEAT_TERMTRUECOLOR
-	"+termtruecolor",
-#else
-	"-termtruecolor",
-#endif
 #ifdef FEAT_TEXTOBJ
 	"+textobjects",
 #else
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1799,
+/**/
     1798,
 /**/
     1797,
diff --git a/src/vim.h b/src/vim.h
index f503ebf..5d98a4c 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1559,21 +1559,21 @@
 #define MSG_PUTS_LONG_ATTR(s, a)    msg_puts_long_attr((char_u *)(s), (a))
 
 #ifdef FEAT_GUI
-# ifdef FEAT_TERMTRUECOLOR
-#  define GUI_FUNCTION(f)	    (gui.in_use ? gui_##f : termtrue_##f)
-#  define USE_24BIT		    (gui.in_use || p_guicolors)
+# ifdef FEAT_TERMGUICOLORS
+#  define GUI_FUNCTION(f)	    (gui.in_use ? gui_##f : termgui_##f)
+#  define USE_24BIT		    (gui.in_use || p_tgc)
 # else
 #  define GUI_FUNCTION(f)	    gui_##f
 #  define USE_24BIT		    gui.in_use
 # endif
 #else
-# ifdef FEAT_TERMTRUECOLOR
-#  define GUI_FUNCTION(f)	    termtrue_##f
-#  define USE_24BIT		    p_guicolors
+# ifdef FEAT_TERMGUICOLORS
+#  define GUI_FUNCTION(f)	    termgui_##f
+#  define USE_24BIT		    p_tgc
 # endif
 #endif
-#ifdef FEAT_TERMTRUECOLOR
-# define IS_CTERM		    (t_colors > 1 || p_guicolors)
+#ifdef FEAT_TERMGUICOLORS
+# define IS_CTERM		    (t_colors > 1 || p_tgc)
 #else
 # define IS_CTERM		    (t_colors > 1)
 #endif