diff --git a/src/diff.c b/src/diff.c
index 8bf0ed8..106bbd1 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -661,6 +661,7 @@
     char_u	*tmp_diff;
     FILE	*fd;
     int		ok;
+    int		io_error = FALSE;
 
     /* Delete all diffblocks. */
     diff_clear(curtab);
@@ -697,18 +698,26 @@
     {
 	ok = FALSE;
 	fd = mch_fopen((char *)tmp_orig, "w");
-	if (fd != NULL)
+	if (fd == NULL)
+	    io_error = TRUE;
+	else
 	{
-	    fwrite("line1\n", (size_t)6, (size_t)1, fd);
+	    if (fwrite("line1\n", (size_t)6, (size_t)1, fd) != 1)
+		io_error = TRUE;
 	    fclose(fd);
 	    fd = mch_fopen((char *)tmp_new, "w");
-	    if (fd != NULL)
+	    if (fd == NULL)
+		io_error = TRUE;
+	    else
 	    {
-		fwrite("line2\n", (size_t)6, (size_t)1, fd);
+		if (fwrite("line2\n", (size_t)6, (size_t)1, fd) != 1)
+		    io_error = TRUE;
 		fclose(fd);
 		diff_file(tmp_orig, tmp_new, tmp_diff);
 		fd = mch_fopen((char *)tmp_diff, "r");
-		if (fd != NULL)
+		if (fd == NULL)
+		    io_error = TRUE;
+		else
 		{
 		    char_u	linebuf[LBUFLEN];
 
@@ -761,6 +770,8 @@
     }
     if (!ok)
     {
+	if (io_error)
+	    EMSG(_("E810: Cannot read or write temp files"));
 	EMSG(_("E97: Cannot create diffs"));
 	diff_a_works = MAYBE;
 #if defined(MSWIN) || defined(MSDOS)
@@ -925,10 +936,10 @@
     {
 # ifdef TEMPDIRNAMES
 	if (vim_tempdir != NULL)
-	    mch_chdir((char *)vim_tempdir);
+	    ignored = mch_chdir((char *)vim_tempdir);
 	else
 # endif
-	    mch_chdir("/tmp");
+	    ignored = mch_chdir("/tmp");
 	shorten_fnames(TRUE);
     }
 #endif
diff --git a/src/eval.c b/src/eval.c
index 7394150..ae78355 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -10641,7 +10641,7 @@
 # ifdef FEAT_WINDOWS
 	    win_T	*wp;
 # endif
-	    int		n = 1;
+	    int		winnr = 1;
 
 	    if (row >= 0 && col >= 0)
 	    {
@@ -10651,9 +10651,9 @@
 		(void)mouse_comp_pos(win, &row, &col, &lnum);
 # ifdef FEAT_WINDOWS
 		for (wp = firstwin; wp != win; wp = wp->w_next)
-		    ++n;
+		    ++winnr;
 # endif
-		vimvars[VV_MOUSE_WIN].vv_nr = n;
+		vimvars[VV_MOUSE_WIN].vv_nr = winnr;
 		vimvars[VV_MOUSE_LNUM].vv_nr = lnum;
 		vimvars[VV_MOUSE_COL].vv_nr = col + 1;
 	    }
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index e3049fb..45d8c81 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -1941,7 +1941,7 @@
 	     * root.
 	     */
 	    if (fp_out != NULL)
-		(void)fchown(fileno(fp_out), st_old.st_uid, st_old.st_gid);
+		ignored = fchown(fileno(fp_out), st_old.st_uid, st_old.st_gid);
 #endif
 	}
     }
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 5a80a07..3e40669 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -8753,8 +8753,8 @@
 		else if (*dirnow != NUL
 			&& (ssop_flags & SSOP_CURDIR) && globaldir != NULL)
 		{
-		    (void)mch_chdir((char *)globaldir);
-		    shorten_fnames(TRUE);
+		    if (mch_chdir((char *)globaldir) == OK)
+			shorten_fnames(TRUE);
 		}
 
 		failed |= (makeopens(fd, dirnow) == FAIL);
diff --git a/src/fileio.c b/src/fileio.c
index a28bcd9..c0dd78d 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -2214,7 +2214,7 @@
     {
 	/* Use stderr for stdin, makes shell commands work. */
 	close(0);
-	dup(2);
+	ignored = dup(2);
     }
 #endif
 
@@ -3449,7 +3449,7 @@
 		{
 # ifdef UNIX
 #  ifdef HAVE_FCHOWN
-		    fchown(fd, st_old.st_uid, st_old.st_gid);
+		    ignored = fchown(fd, st_old.st_uid, st_old.st_gid);
 #  endif
 		    if (mch_stat((char *)IObuff, &st) < 0
 			    || st.st_uid != st_old.st_uid
@@ -4365,7 +4365,7 @@
 		|| st.st_uid != st_old.st_uid
 		|| st.st_gid != st_old.st_gid)
 	{
-	    fchown(fd, st_old.st_uid, st_old.st_gid);
+	    ignored = fchown(fd, st_old.st_uid, st_old.st_gid);
 	    if (perm >= 0)	/* set permission again, may have changed */
 		(void)mch_setperm(wfname, perm);
 	}
@@ -6030,9 +6030,9 @@
 	{
 	    tbuf[FGETS_SIZE - 2] = NUL;
 #ifdef USE_CR
-	    fgets_cr((char *)tbuf, FGETS_SIZE, fp);
+	    ignoredp = fgets_cr((char *)tbuf, FGETS_SIZE, fp);
 #else
-	    fgets((char *)tbuf, FGETS_SIZE, fp);
+	    ignoredp = fgets((char *)tbuf, FGETS_SIZE, fp);
 #endif
 	} while (tbuf[FGETS_SIZE - 2] != NUL && tbuf[FGETS_SIZE - 2] != '\n');
     }
diff --git a/src/fold.c b/src/fold.c
index b7b8ea7..1fe7c5a 100644
--- a/src/fold.c
+++ b/src/fold.c
@@ -48,7 +48,7 @@
 static int foldFind __ARGS((garray_T *gap, linenr_T lnum, fold_T **fpp));
 static int foldLevelWin __ARGS((win_T *wp, linenr_T lnum));
 static void checkupdate __ARGS((win_T *wp));
-static void setFoldRepeat __ARGS((linenr_T lnum, long count, int open));
+static void setFoldRepeat __ARGS((linenr_T lnum, long count, int do_open));
 static linenr_T setManualFold __ARGS((linenr_T lnum, int opening, int recurse, int *donep));
 static linenr_T setManualFoldWin __ARGS((win_T *wp, linenr_T lnum, int opening, int recurse, int *donep));
 static void foldOpenNested __ARGS((fold_T *fpr));
@@ -1241,10 +1241,10 @@
  * Repeat "count" times.
  */
     static void
-setFoldRepeat(lnum, count, open)
+setFoldRepeat(lnum, count, do_open)
     linenr_T	lnum;
     long	count;
-    int		open;
+    int		do_open;
 {
     int		done;
     long	n;
@@ -1252,7 +1252,7 @@
     for (n = 0; n < count; ++n)
     {
 	done = DONE_NOTHING;
-	(void)setManualFold(lnum, open, FALSE, &done);
+	(void)setManualFold(lnum, do_open, FALSE, &done);
 	if (!(done & DONE_ACTION))
 	{
 	    /* Only give an error message when no fold could be opened. */
diff --git a/src/getchar.c b/src/getchar.c
index d4066c2..081368d 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -4702,7 +4702,7 @@
 			return FAIL;
 		    if (mp->m_noremap != REMAP_YES && fprintf(fd, "nore") < 0)
 			return FAIL;
-		    if (fprintf(fd, cmd) < 0)
+		    if (fputs(cmd, fd) < 0)
 			return FAIL;
 		    if (buf != NULL && fputs(" <buffer>", fd) < 0)
 			return FAIL;
@@ -4801,7 +4801,7 @@
 	    }
 	    if (IS_SPECIAL(c) || modifiers)	/* special key */
 	    {
-		if (fprintf(fd, (char *)get_special_key_name(c, modifiers)) < 0)
+		if (fputs((char *)get_special_key_name(c, modifiers), fd) < 0)
 		    return FAIL;
 		continue;
 	    }
diff --git a/src/globals.h b/src/globals.h
index c03c693..e26a317 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1549,6 +1549,14 @@
 EXTERN time_t starttime;
 
 /*
+ * Some compilers warn for not using a return value, but in some situations we
+ * can't do anything useful with the value.  Assign to this variable to avoid
+ * the warning.
+ */
+EXTERN int ignored;
+EXTERN char *ignoredp;
+
+/*
  * Optional Farsi support.  Include it here, so EXTERN and INIT are defined.
  */
 #ifdef FEAT_FKMAP
diff --git a/src/gui.c b/src/gui.c
index 426cea9..b937189 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -139,7 +139,7 @@
 		/* The read returns when the child closes the pipe (or when
 		 * the child dies for some reason). */
 		close(pipefd[1]);
-		(void)read(pipefd[0], &dummy, (size_t)1);
+		ignored = (int)read(pipefd[0], &dummy, (size_t)1);
 		close(pipefd[0]);
 	    }
 
diff --git a/src/gui_at_sb.c b/src/gui_at_sb.c
index 5fe3afb..1726953 100644
--- a/src/gui_at_sb.c
+++ b/src/gui_at_sb.c
@@ -1078,6 +1078,12 @@
     Cardinal	*num_params;	/* unused */
 {
     ScrollbarWidget sbw = (ScrollbarWidget)w;
+    /* Use a union to avoid a warning for the weird conversion from float to
+     * XtPointer.  Comes from Xaw/Scrollbar.c. */
+    union {
+	XtPointer xtp;
+	float xtf;
+    } xtpf;
 
     if (LookAhead(w, event))
 	return;
@@ -1085,7 +1091,8 @@
     /* thumbProc is not pretty, but is necessary for backwards
        compatibility on those architectures for which it work{s,ed};
        the intent is to pass a (truncated) float by value. */
-    XtCallCallbacks(w, XtNthumbProc, *(XtPointer*)&sbw->scrollbar.top);
+    xtpf.xtf = sbw->scrollbar.top;
+    XtCallCallbacks(w, XtNthumbProc, xtpf.xtp);
     XtCallCallbacks(w, XtNjumpProc, (XtPointer)&sbw->scrollbar.top);
 }
 
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index dc95d81..cd65557 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -4070,14 +4070,14 @@
 
 	if (mask & (XValue | YValue))
 	{
-	    int w, h;
-	    gui_mch_get_screen_dimensions(&w, &h);
-	    h += p_ghr + get_menu_tool_height();
-	    w += get_menu_tool_width();
+	    int ww, hh;
+	    gui_mch_get_screen_dimensions(&ww, &hh);
+	    hh += p_ghr + get_menu_tool_height();
+	    ww += get_menu_tool_width();
 	    if (mask & XNegative)
-		x += w - pixel_width;
+		x += ww - pixel_width;
 	    if (mask & YNegative)
-		y += h - pixel_height;
+		y += hh - pixel_height;
 #ifdef HAVE_GTK2
 	    gtk_window_move(GTK_WINDOW(gui.mainwin), x, y);
 #else
diff --git a/src/gui_xmdlg.c b/src/gui_xmdlg.c
index 95e3268..cbdbe68 100644
--- a/src/gui_xmdlg.c
+++ b/src/gui_xmdlg.c
@@ -369,10 +369,10 @@
     char	buf[TEMP_BUF_SIZE];
     XmString	items[MAX_ENTRIES_IN_LIST];
     int		i;
-    int		index;
+    int		idx;
 
-    for (index = (int)ENCODING; index < (int)NONE; ++index)
-	count[index] = 0;
+    for (idx = (int)ENCODING; idx < (int)NONE; ++idx)
+	count[idx] = 0;
 
     /* First we insert the wild char into every single list. */
     if (fix != ENCODING)
@@ -503,14 +503,14 @@
     /*
      * Now loop trough the remaining lists and set them up.
      */
-    for (index = (int)NAME; index < (int)NONE; ++index)
+    for (idx = (int)NAME; idx < (int)NONE; ++idx)
     {
 	Widget w;
 
-	if (fix == (enum ListSpecifier)index)
+	if (fix == (enum ListSpecifier)idx)
 	    continue;
 
-	switch ((enum ListSpecifier)index)
+	switch ((enum ListSpecifier)idx)
 	{
 	    case NAME:
 		w = data->list[NAME];
@@ -525,21 +525,21 @@
 		w = (Widget)0;	/* for lint */
 	}
 
-	for (i = 0; i < count[index]; ++i)
+	for (i = 0; i < count[idx]; ++i)
 	{
-	    items[i] = XmStringCreateLocalized(list[index][i]);
-	    XtFree(list[index][i]);
+	    items[i] = XmStringCreateLocalized(list[idx][i]);
+	    XtFree(list[idx][i]);
 	}
 	XmListDeleteAllItems(w);
-	XmListAddItems(w, items, count[index], 1);
-	if (data->sel[index])
+	XmListAddItems(w, items, count[idx], 1);
+	if (data->sel[idx])
 	{
 	    XmStringFree(items[0]);
-	    items[0] = XmStringCreateLocalized(data->sel[index]);
+	    items[0] = XmStringCreateLocalized(data->sel[idx]);
 	    XmListSelectItem(w, items[0], False);
 	    XmListSetBottomItem(w, items[0]);
 	}
-	for (i = 0; i < count[index]; ++i)
+	for (i = 0; i < count[idx]; ++i)
 	    XmStringFree(items[i]);
     }
 }
@@ -695,14 +695,14 @@
 	int	    n;
 	XmString    str;
 	Arg	    args[4];
-	char	    *msg = _("no specific match");
+	char	    *nomatch_msg = _("no specific match");
 
 	n = 0;
-	str = XmStringCreateLocalized(msg);
+	str = XmStringCreateLocalized(nomatch_msg);
 	XtSetArg(args[n], XmNlabelString, str); ++n;
 	XtSetValues(data->sample, args, n);
 	apply_fontlist(data->sample);
-	XmTextSetString(data->name, msg);
+	XmTextSetString(data->name, nomatch_msg);
 	XmStringFree(str);
 
 	return False;
@@ -886,21 +886,21 @@
     {
 	int	i;
 	int	max;
-	int	index = 0;
+	int	idx = 0;
 	int	size;
-	char	str[128];
+	char	buf[128];
 
 	for (i = 0, max = 0; i < data->num; i++)
 	{
-	    get_part(fn(data, i), 7, str);
-	    size = atoi(str);
+	    get_part(fn(data, i), 7, buf);
+	    size = atoi(buf);
 	    if ((size > max) && (size < MAX_DISPLAY_SIZE))
 	    {
-		index = i;
+		idx = i;
 		max = size;
 	    }
 	}
-	strcpy(big_font, fn(data, index));
+	strcpy(big_font, fn(data, idx));
     }
     data->old = XLoadQueryFont(XtDisplay(parent), big_font);
     data->old_list = gui_motif_create_fontlist(data->old);
@@ -1217,28 +1217,28 @@
 
 	if (i != 0)
 	{
-	    char name[TEMP_BUF_SIZE];
-	    char style[TEMP_BUF_SIZE];
-	    char size[TEMP_BUF_SIZE];
-	    char encoding[TEMP_BUF_SIZE];
+	    char namebuf[TEMP_BUF_SIZE];
+	    char stylebuf[TEMP_BUF_SIZE];
+	    char sizebuf[TEMP_BUF_SIZE];
+	    char encodingbuf[TEMP_BUF_SIZE];
 	    char *found;
 
 	    found = names[0];
 
-	    name_part(found, name);
-	    style_part(found, style);
-	    size_part(found, size, data->in_pixels);
-	    encoding_part(found, encoding);
+	    name_part(found, namebuf);
+	    style_part(found, stylebuf);
+	    size_part(found, sizebuf, data->in_pixels);
+	    encoding_part(found, encodingbuf);
 
-	    if (strlen(name) > 0
-		    && strlen(style) > 0
-		    && strlen(size) > 0
-		    && strlen(encoding) > 0)
+	    if (strlen(namebuf) > 0
+		    && strlen(stylebuf) > 0
+		    && strlen(sizebuf) > 0
+		    && strlen(encodingbuf) > 0)
 	    {
-		data->sel[NAME] = XtNewString(name);
-		data->sel[STYLE] = XtNewString(style);
-		data->sel[SIZE] = XtNewString(size);
-		data->sel[ENCODING] = XtNewString(encoding);
+		data->sel[NAME] = XtNewString(namebuf);
+		data->sel[STYLE] = XtNewString(stylebuf);
+		data->sel[SIZE] = XtNewString(sizebuf);
+		data->sel[ENCODING] = XtNewString(encodingbuf);
 		data->font_name = XtNewString(names[0]);
 		display_sample(data);
 		XmTextSetString(data->name, data->font_name);
diff --git a/src/gui_xmebw.c b/src/gui_xmebw.c
index 77b59c2..3e134ce 100644
--- a/src/gui_xmebw.c
+++ b/src/gui_xmebw.c
@@ -1256,7 +1256,7 @@
     }
     else
     {
-	int adjust = 0;
+	adjust = 0;
 
 #if !defined(LESSTIF_VERSION) && (XmVersion > 1002)
 	/*
@@ -1268,12 +1268,11 @@
 	{
 	    case XmEXTERNAL_HIGHLIGHT:
 		adjust = (eb->primitive.highlight_thickness -
-			(eb->pushbutton.default_button_shadow_thickness ?
-			 Xm3D_ENHANCE_PIXEL : 0));
+			 (eb->pushbutton.default_button_shadow_thickness
+			  ?  Xm3D_ENHANCE_PIXEL : 0));
 		break;
 
 	    case XmINTERNAL_HIGHLIGHT:
-		adjust = 0;
 		break;
 
 	    default:
diff --git a/src/main.c b/src/main.c
index a091165..9f56e88 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2372,7 +2372,7 @@
      * Is there any other system that cannot do this?
      */
     close(0);
-    dup(2);
+    ignored = dup(2);
 #endif
 }
 
diff --git a/src/mbyte.c b/src/mbyte.c
index a2ffd7e..42b3063 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -717,7 +717,7 @@
 		     * where mblen() returns 0 for invalid character.
 		     * Therefore, following condition includes 0.
 		     */
-		    (void)mblen(NULL, 0);	/* First reset the state. */
+		    ignored = mblen(NULL, 0);	/* First reset the state. */
 		    if (mblen(buf, (size_t)1) <= 0)
 			n = 2;
 		    else
@@ -5278,7 +5278,7 @@
 
 /*ARGSUSED*/
     static void
-preedit_start_cbproc(XIC xic, XPointer client_data, XPointer call_data)
+preedit_start_cbproc(XIC thexic, XPointer client_data, XPointer call_data)
 {
 #ifdef XIM_DEBUG
     xim_log("xim_decide_input_style()\n");
@@ -5312,7 +5312,7 @@
 
 /*ARGSUSED*/
     static void
-preedit_draw_cbproc(XIC xic, XPointer client_data, XPointer call_data)
+preedit_draw_cbproc(XIC thexic, XPointer client_data, XPointer call_data)
 {
     XIMPreeditDrawCallbackStruct *draw_data;
     XIMText	*text;
@@ -5453,7 +5453,7 @@
 
 /*ARGSUSED*/
     static void
-preedit_caret_cbproc(XIC xic, XPointer client_data, XPointer call_data)
+preedit_caret_cbproc(XIC thexic, XPointer client_data, XPointer call_data)
 {
 #ifdef XIM_DEBUG
     xim_log("preedit_caret_cbproc()\n");
@@ -5462,7 +5462,7 @@
 
 /*ARGSUSED*/
     static void
-preedit_done_cbproc(XIC xic, XPointer client_data, XPointer call_data)
+preedit_done_cbproc(XIC thexic, XPointer client_data, XPointer call_data)
 {
 #ifdef XIM_DEBUG
     xim_log("preedit_done_cbproc()\n");
diff --git a/src/message.c b/src/message.c
index bf340d0..548a89e 100644
--- a/src/message.c
+++ b/src/message.c
@@ -4585,61 +4585,62 @@
 			if (remove_trailing_zeroes)
 			{
 			    int i;
-			    char *p;
+			    char *tp;
 
 			    /* Using %g or %G: remove superfluous zeroes. */
 			    if (fmt_spec == 'f')
-				p = tmp + str_arg_l - 1;
+				tp = tmp + str_arg_l - 1;
 			    else
 			    {
-				p = (char *)vim_strchr((char_u *)tmp,
+				tp = (char *)vim_strchr((char_u *)tmp,
 						 fmt_spec == 'e' ? 'e' : 'E');
-				if (p != NULL)
+				if (tp != NULL)
 				{
 				    /* Remove superfluous '+' and leading
 				     * zeroes from the exponent. */
-				    if (p[1] == '+')
+				    if (tp[1] == '+')
 				    {
 					/* Change "1.0e+07" to "1.0e07" */
-					STRMOVE(p + 1, p + 2);
+					STRMOVE(tp + 1, tp + 2);
 					--str_arg_l;
 				    }
-				    i = (p[1] == '-') ? 2 : 1;
-				    while (p[i] == '0')
+				    i = (tp[1] == '-') ? 2 : 1;
+				    while (tp[i] == '0')
 				    {
 					/* Change "1.0e07" to "1.0e7" */
-					STRMOVE(p + i, p + i + 1);
+					STRMOVE(tp + i, tp + i + 1);
 					--str_arg_l;
 				    }
-				    --p;
+				    --tp;
 				}
 			    }
 
-			    if (p != NULL && !precision_specified)
+			    if (tp != NULL && !precision_specified)
 				/* Remove trailing zeroes, but keep the one
 				 * just after a dot. */
-				while (p > tmp + 2 && *p == '0' && p[-1] != '.')
+				while (tp > tmp + 2 && *tp == '0'
+							     && tp[-1] != '.')
 				{
-				    STRMOVE(p, p + 1);
-				    --p;
+				    STRMOVE(tp, tp + 1);
+				    --tp;
 				    --str_arg_l;
 				}
 			}
 			else
 			{
-			    char *p;
+			    char *tp;
 
 			    /* Be consistent: some printf("%e") use 1.0e+12
 			     * and some 1.0e+012.  Remove one zero in the last
 			     * case. */
-			    p = (char *)vim_strchr((char_u *)tmp,
+			    tp = (char *)vim_strchr((char_u *)tmp,
 						 fmt_spec == 'e' ? 'e' : 'E');
-			    if (p != NULL && (p[1] == '+' || p[1] == '-')
-					  && p[2] == '0'
-					  && vim_isdigit(p[3])
-					  && vim_isdigit(p[4]))
+			    if (tp != NULL && (tp[1] == '+' || tp[1] == '-')
+					  && tp[2] == '0'
+					  && vim_isdigit(tp[3])
+					  && vim_isdigit(tp[4]))
 			    {
-				STRMOVE(p + 2, p + 3);
+				STRMOVE(tp + 2, tp + 3);
 				--str_arg_l;
 			    }
 			}
diff --git a/src/netbeans.c b/src/netbeans.c
index 19c3650..92ca89f 100644
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -1043,7 +1043,7 @@
 	nbdebug(("EVT: %s", buf));
 /*	nb_send(buf, "netbeans_end");    avoid "write failed" messages */
 	if (sd >= 0)
-	    sock_write(sd, buf, (int)STRLEN(buf));  /* ignore errors */
+	    ignored = sock_write(sd, buf, (int)STRLEN(buf));
     }
 }
 
@@ -2277,9 +2277,6 @@
 	    int serNum;
 	    int localTypeNum;
 	    int typeNum;
-# ifdef NBDEBUG
-	    int len;
-# endif
 	    pos_T *pos;
 
 	    if (buf == NULL || buf->bufp == NULL)
@@ -2303,13 +2300,10 @@
 	    pos = get_off_or_lnum(buf->bufp, &args);
 
 	    cp = (char *)args;
-# ifdef NBDEBUG
-	    len =
-# endif
-		strtol(cp, &cp, 10);
+	    ignored = (int)strtol(cp, &cp, 10);
 	    args = (char_u *)cp;
 # ifdef NBDEBUG
-	    if (len != -1)
+	    if (ignored != -1)
 	    {
 		nbdebug(("    partial line annotation -- Not Yet Implemented!\n"));
 	    }
diff --git a/src/option.c b/src/option.c
index e8b8b0c..15986f4 100644
--- a/src/option.c
+++ b/src/option.c
@@ -8232,13 +8232,13 @@
 	    {
 		if (number == 0 && string != NULL)
 		{
-		    int index;
+		    int idx;
 
 		    /* Either we are given a string or we are setting option
 		     * to zero. */
-		    for (index = 0; string[index] == '0'; ++index)
+		    for (idx = 0; string[idx] == '0'; ++idx)
 			;
-		    if (string[index] != NUL || index == 0)
+		    if (string[idx] != NUL || idx == 0)
 		    {
 			/* There's another character after zeros or the string
 			 * is empty.  In both cases, we are trying to set a
diff --git a/src/os_unix.c b/src/os_unix.c
index 782265b..9d6f6cb 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -315,12 +315,15 @@
     {-1,	    "Unknown!", FALSE}
 };
 
+/*
+ * Write s[len] to the screen.
+ */
     void
 mch_write(s, len)
     char_u	*s;
     int		len;
 {
-    write(1, (char *)s, len);
+    ignored = (int)write(1, (char *)s, len);
     if (p_wd)		/* Unix is too fast, slow down a bit more */
 	RealWaitForChar(read_cmd_fd, p_wd, NULL);
 }
@@ -3927,9 +3930,9 @@
 		 */
 		if (fd >= 0)
 		{
-		    dup(fd); /* To replace stdin  (file descriptor 0) */
-		    dup(fd); /* To replace stdout (file descriptor 1) */
-		    dup(fd); /* To replace stderr (file descriptor 2) */
+		    ignored = dup(fd); /* To replace stdin  (fd 0) */
+		    ignored = dup(fd); /* To replace stdout (fd 1) */
+		    ignored = dup(fd); /* To replace stderr (fd 2) */
 
 		    /* Don't need this now that we've duplicated it */
 		    close(fd);
@@ -3997,13 +4000,13 @@
 
 		    /* set up stdin/stdout/stderr for the child */
 		    close(0);
-		    dup(pty_slave_fd);
+		    ignored = dup(pty_slave_fd);
 		    close(1);
-		    dup(pty_slave_fd);
+		    ignored = dup(pty_slave_fd);
 		    if (gui.in_use)
 		    {
 			close(2);
-			dup(pty_slave_fd);
+			ignored = dup(pty_slave_fd);
 		    }
 
 		    close(pty_slave_fd);    /* has been dupped, close it now */
@@ -4014,13 +4017,13 @@
 		    /* set up stdin for the child */
 		    close(fd_toshell[1]);
 		    close(0);
-		    dup(fd_toshell[0]);
+		    ignored = dup(fd_toshell[0]);
 		    close(fd_toshell[0]);
 
 		    /* set up stdout for the child */
 		    close(fd_fromshell[0]);
 		    close(1);
-		    dup(fd_fromshell[1]);
+		    ignored = dup(fd_fromshell[1]);
 		    close(fd_fromshell[1]);
 
 # ifdef FEAT_GUI
@@ -4028,7 +4031,7 @@
 		    {
 			/* set up stderr for the child */
 			close(2);
-			dup(1);
+			ignored = dup(1);
 		    }
 # endif
 		}
@@ -4159,7 +4162,8 @@
 					    && (lnum !=
 						    curbuf->b_ml.ml_line_count
 						    || curbuf->b_p_eol)))
-				    write(toshell_fd, "\n", (size_t)1);
+				    ignored = write(toshell_fd, "\n",
+								   (size_t)1);
 				++lnum;
 				if (lnum > curbuf->b_op_end.lnum)
 				{
diff --git a/src/spell.c b/src/spell.c
index 039dfca..4807fff 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -4950,7 +4950,7 @@
 static void put_sugtime __ARGS((spellinfo_T *spin, FILE *fd));
 static int write_vim_spell __ARGS((spellinfo_T *spin, char_u *fname));
 static void clear_node __ARGS((wordnode_T *node));
-static int put_node __ARGS((FILE *fd, wordnode_T *node, int index, int regionmask, int prefixtree));
+static int put_node __ARGS((FILE *fd, wordnode_T *node, int idx, int regionmask, int prefixtree));
 static void spell_make_sugfile __ARGS((spellinfo_T *spin, char_u *wfname));
 static int sug_filltree __ARGS((spellinfo_T *spin, slang_T *slang));
 static int sug_maketable __ARGS((spellinfo_T *spin));
diff --git a/src/ui.c b/src/ui.c
index 6d408b0..8cff1d8 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -1820,7 +1820,7 @@
 #ifdef HAVE_DUP
 	    /* Use stderr for stdin, also works for shell commands. */
 	    close(0);
-	    dup(2);
+	    ignored = dup(2);
 #else
 	    read_cmd_fd = 2;	/* read from stderr instead of stdin */
 #endif
diff --git a/src/version.c b/src/version.c
index 5e44f9a..8b6c021 100644
--- a/src/version.c
+++ b/src/version.c
@@ -677,6 +677,10 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    55,
+/**/
+    54,
+/**/
     53,
 /**/
     52,
diff --git a/src/window.c b/src/window.c
index 2feb9e2..b360f54 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4029,14 +4029,14 @@
 	    if (mch_dirname(cwd, MAXPATHL) == OK)
 		globaldir = vim_strsave(cwd);
 	}
-	mch_chdir((char *)curwin->w_localdir);
-	shorten_fnames(TRUE);
+	if (mch_chdir((char *)curwin->w_localdir) == 0)
+	    shorten_fnames(TRUE);
     }
     else if (globaldir != NULL)
     {
 	/* Window doesn't have a local directory and we are not in the global
 	 * directory: Change to the global directory. */
-	mch_chdir((char *)globaldir);
+	ignored = mch_chdir((char *)globaldir);
 	vim_free(globaldir);
 	globaldir = NULL;
 	shorten_fnames(TRUE);