Some broken build environments treat fprintf(fh, buf) as a fatal error...

libvncserver/main.c

@@ -242,7 +242,7 @@ rfbDefaultLog(const char *format, ...)
 
     time(&log_clock);
     strftime(buf, 255, "%d/%m/%Y %X ", localtime(&log_clock));
-    fprintf(stderr,buf);
+    fprintf(stderr, "%s", buf);
 
     vfprintf(stderr, format, args);
     fflush(stderr);