diff --git a/src/wxxt/src/GDI-Classes/Font.cc b/src/wxxt/src/GDI-Classes/Font.cc
index 76a07a553e..e528952500 100644
--- a/src/wxxt/src/GDI-Classes/Font.cc
+++ b/src/wxxt/src/GDI-Classes/Font.cc
@@ -737,7 +737,11 @@ static wxFontStruct *wxLoadQueryNearestAAFont(const char *name,
 	     : XFT_SLANT_ROMAN));
 
     ex_tags[0] = NULL;
+    ex_types[0] = 0;
+    ex_vals[0] = 0;
     ex_tags[1] = NULL;
+    ex_types[1] = 0;
+    ex_vals[1] = 0;
 
     switch (smoothing) {
     case wxSMOOTHING_OFF:
diff --git a/src/wxxt/src/XWidgets/xwTabString.c b/src/wxxt/src/XWidgets/xwTabString.c
index 3c4e672a41..1c4dd99e4d 100644
--- a/src/wxxt/src/XWidgets/xwTabString.c
+++ b/src/wxxt/src/XWidgets/xwTabString.c
@@ -23,7 +23,7 @@ extern wxExtFont wxFindAAFont(Display *dpy, wxExtFont xfont, int c);
 static int leading_utf8_len(char *s, int len)
 {
   long ipos;
-  scheme_utf8_decode(s, 0, len, 
+  scheme_utf8_decode((const unsigned char *)s, 0, len, 
 		     NULL, 0, 1,
 		     &ipos, 0, '?');
   return ipos;
@@ -55,12 +55,12 @@ static int xdoDraw(measure, font,
   long ulen;
   int width = 0;
 
-  ulen = scheme_utf8_decode_all(string, length, NULL, '?');
+  ulen = scheme_utf8_decode_all((unsigned char *)string, length, NULL, '?');
   if (ulen <= WXTAB_BUF_SIZE)
     us = usbuf;
   else
     us = (unsigned int *)XtMalloc(ulen * sizeof(unsigned int));
-  ulen = scheme_utf8_decode_all(string, length, us, '?');
+  ulen = scheme_utf8_decode_all((unsigned char *)string, length, us, '?');
 
 #ifdef WX_USE_XFT
   if (!xfont)
diff --git a/src/wxxt/utils/image/src/wx_xbm.cc b/src/wxxt/utils/image/src/wx_xbm.cc
index b728a71e38..e3892f19b7 100644
--- a/src/wxxt/utils/image/src/wx_xbm.cc
+++ b/src/wxxt/utils/image/src/wx_xbm.cc
@@ -143,7 +143,7 @@ int wxImage::LoadXBM(char *fname, int /* nc */)
   /* read/convert the image data */
 
   for (i=0, pix=pic; i<h; i++) {
-    for (j=0,bit=0; j<w; j++, pix++, bit = ++bit&7) {
+    for (j=0,bit=0; j<w; j++, pix++, bit = ((bit + 1) & 0x7)) {
 
       if (!bit) {
 	/* get next byte from file.  we're already positioned at it */