diff --git a/FL/forms.H b/FL/forms.H
index 46409772a..672b9c813 100644
--- a/FL/forms.H
+++ b/FL/forms.H
@@ -645,7 +645,7 @@ fl_add_free(int t,double x,double y,double w,double h,const char* l,
 #include "fl_ask.H"
 #include "fl_show_colormap.H"
 
-inline int fl_show_question(const char* c, int = 0) {return fl_choice(c,"No","Yes",0L);}
+inline int fl_show_question(const char* c, int = 0) {return fl_choice("%s",fl_no,fl_yes,0L,c);}
 FL_EXPORT void fl_show_message(const char *,const char *,const char *);
 FL_EXPORT void fl_show_alert(const char *,const char *,const char *,int=0);
 FL_EXPORT int fl_show_question(const char *,const char *,const char *);
diff --git a/fluid/fluid.cxx b/fluid/fluid.cxx
index c1b0799e7..2f7ebfbb9 100644
--- a/fluid/fluid.cxx
+++ b/fluid/fluid.cxx
@@ -982,10 +982,10 @@ void print_menu_cb(Fl_Widget *, void *) {
 
     fl_draw(basename, 0, fontsize);
 
-    fl_draw(date, 0.5 * (width - fl_width(date)), fontsize);
+    fl_draw(date, (width - (int)fl_width(date)) / 2, fontsize);
 
     sprintf(buffer, "%d/%d", winpage + 1, num_windows);
-    fl_draw(buffer, width - fl_width(buffer), fontsize);
+    fl_draw(buffer, width - (int)fl_width(buffer), fontsize);
 
     // Get window image...
     uchar	*pixels;		// Window image data
@@ -1000,8 +1000,8 @@ void print_menu_cb(Fl_Widget *, void *) {
 
     // Figure out the window size, first at 100 PPI and then scaled
     // down if that is too big...
-    ww = w * xdpi / 100.0;
-    hh = h * ydpi / 100.0;
+    ww = w * xdpi / 100;
+    hh = h * ydpi / 100;
 
     if (ww > width) {
       ww = width;
diff --git a/src/Fl_Gl_Window.cxx b/src/Fl_Gl_Window.cxx
index ac2ed93a3..e9f7de202 100644
--- a/src/Fl_Gl_Window.cxx
+++ b/src/Fl_Gl_Window.cxx
@@ -95,8 +95,10 @@ int Fl_Gl_Window::mode(int m, const int *a) {
   if (m == mode_ && a == alist) return 0;
 #ifndef __APPLE__
   int oldmode = mode_;
+#endif // !__APPLE__
+#if !defined(WIN32) && !defined(__APPLE__)
   Fl_Gl_Choice* oldg = g;
-#endif
+#endif // !WIN32 && !__APPLE__
   context(0);
   mode_ = m; alist = a;
   if (shown()) {
diff --git a/src/Fl_win32.cxx b/src/Fl_win32.cxx
index c3764c7ca..d9886d2cf 100644
--- a/src/Fl_win32.cxx
+++ b/src/Fl_win32.cxx
@@ -158,9 +158,9 @@ void Fl::add_fd(int n, int events, void (*cb)(int, void*), void *v) {
   if (events & POLLERR) mask |= FD_CLOSE;
   WSAAsyncSelect(n, fl_window, WM_FLSELECT, mask);
 #else
-  if (events & POLLIN) FD_SET(n, &fdsets[0]);
-  if (events & POLLOUT) FD_SET(n, &fdsets[1]);
-  if (events & POLLERR) FD_SET(n, &fdsets[2]);
+  if (events & POLLIN) FD_SET((unsigned)n, &fdsets[0]);
+  if (events & POLLOUT) FD_SET((unsigned)n, &fdsets[1]);
+  if (events & POLLERR) FD_SET((unsigned)n, &fdsets[2]);
   if (n > maxfd) maxfd = n;
 #endif // USE_ASYNC_SELECT
 }
diff --git a/src/scandir_win32.c b/src/scandir_win32.c
index 1bf9fe7dc..e5b11ba6e 100644
--- a/src/scandir_win32.c
+++ b/src/scandir_win32.c
@@ -43,7 +43,7 @@ int fl_scandir(const char *dirname, struct dirent ***namelist,
   unsigned long ret;
 
   len    = strlen(dirname);
-  findIn = (char *)malloc(len+5);
+  findIn = (char *)malloc((size_t)(len+5));
 
   if (!findIn) return -1;
 
@@ -72,7 +72,7 @@ int fl_scandir(const char *dirname, struct dirent ***namelist,
     }
     if (!select || (*select)(selectDir)) {
       if (nDir==NDir) {
-	struct dirent **tempDir = (struct dirent **)calloc(sizeof(struct dirent*), NDir+33);
+	struct dirent **tempDir = (struct dirent **)calloc(sizeof(struct dirent*), (size_t)(NDir+33));
 	if (NDir) memcpy(tempDir, dir, sizeof(struct dirent*)*NDir);
 	if (dir) free(dir);
 	dir = tempDir;
@@ -94,8 +94,8 @@ int fl_scandir(const char *dirname, struct dirent ***namelist,
 
   free (findIn);
 
-  if (compar) qsort (dir, nDir, sizeof(*dir),
-		     (int(*)(const void*, const void*))compar);
+  if (compar) qsort(dir, (size_t)nDir, sizeof(*dir),
+		    (int(*)(const void*, const void*))compar);
 
   *namelist = dir;
   return nDir;