Conditionalise (X-specific) Error_Handler() on OPENGL_X11

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@31856 15284696-431f-4ddb-bdfa-cd5b030d7da7

visualization/nviz/src/do_zoom.c

@@ -352,6 +352,7 @@ static void create_pixmap(int width, int height)
 #endif
 }
 
+#ifdef OPENGL_X11
 static int Error_Handler(ClientData closure, XErrorEvent *event)
 {
     if (!dpy)
@@ -359,6 +360,7 @@ static int Error_Handler(ClientData closure, XErrorEvent *event)
     XmuPrintDefaultErrorMessage(dpy, event, stderr);
     return 0;
 }
+#endif
 
 int Create_OS_Ctx(int width, int height)
 {