--- fvwm/builtins.c
+++ fvwm/builtins.c
@@ -2884,7 +2884,7 @@
 	int ret;
 	unsigned long argument, data1 = 0, data2 = 0;
 
-	if (action == NULL || action == "\0")
+	if (action == NULL || (strcmp(action,"\0") == 0))
 	{
 		return;
 	}
--- libs/Flocale.c
+++ libs/Flocale.c
@@ -1080,7 +1080,7 @@
 	fftf = FftGetFont(dpy, fn, module);
 	if (fftf == NULL)
 	{
-		if (fn != NULL && fn != FLOCALE_FFT_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *)FLOCALE_FFT_FALLBACK_FONT)
 		{
 			free(fn);
 		}
@@ -1095,7 +1095,7 @@
 		&flf->fftf, &flf->height, &flf->ascent, &flf->descent);
 	FftGetFontWidths(flf, &flf->max_char_width);
 	free(fftf);
-	if (fn != NULL && fn != FLOCALE_FFT_FALLBACK_FONT)
+	if (fn != NULL && fn != (char *) FLOCALE_FFT_FALLBACK_FONT)
 	{
 		free(fn);
 	}
@@ -1124,7 +1124,7 @@
 	}
 	else if (!(fn_fixed = FlocaleFixNameForFontSet(dpy, fn, module)))
 	{
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *) FLOCALE_MB_FALLBACK_FONT)
 		{
 			free(fn);
 		}
@@ -1136,7 +1136,7 @@
 		{
 			free(fn_fixed);
 		}
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *) FLOCALE_MB_FALLBACK_FONT)
 		{
 			free(fn);
 		}
@@ -1185,7 +1185,7 @@
 	{
 		free(fn_fixed);
 	}
-	if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+	if (fn != NULL && fn != (char *) FLOCALE_MB_FALLBACK_FONT)
 	{
 		free(fn);
 	}
@@ -1212,7 +1212,7 @@
 			fn = FLOCALE_FALLBACK_FONT;
 		}
 		font = XLoadQueryFont(dpy, fn);
-		if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *) FLOCALE_FALLBACK_FONT)
 		{
 			free(fn);
 			fn = NULL;
@@ -1224,7 +1224,7 @@
 	}
 	if (font == NULL)
 	{
-		if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *) FLOCALE_FALLBACK_FONT)
 		{
 			free(fn);
 		}
@@ -1248,7 +1248,7 @@
 	flf->max_char_width = font->max_bounds.width;
 	if (flf->font->max_byte1 > 0)
 		flf->flags.is_mb = True;
-	if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+	if (fn != NULL && fn != (char *) FLOCALE_FALLBACK_FONT)
 	{
 		free(fn);
 	}
@@ -1460,8 +1460,8 @@
 	{
 		flf = FlocaleGetFontOrFontSet(
 			dpy, fn, encoding, fontname, module);
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT &&
-		    fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != (char *) FLOCALE_MB_FALLBACK_FONT &&
+		    fn != (char *) FLOCALE_FALLBACK_FONT)
 		{
 			free(fn);
 			fn = NULL;
@@ -1471,8 +1471,8 @@
 			str = GetQuotedString(str, &fn, ";", NULL, NULL, NULL);
 		}
 	}
-	if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT &&
-	    fn != FLOCALE_FALLBACK_FONT)
+	if (fn != NULL && fn != (char *) FLOCALE_MB_FALLBACK_FONT &&
+	    fn != (char *) FLOCALE_FALLBACK_FONT)
 	{
 		free(fn);
 	}