--- gcolor2-0.4.old/src/callbacks.c
+++ gcolor2-0.4/src/callbacks.c
@@ -4,18 +4,22 @@
 
 #include <gtk/gtk.h>
 #include <stdio.h>
+#include <string.h>
+#include <glib/gprintf.h>
 
 #include "callbacks.h"
 #include "interface.h"
 #include "support.h"
 
+GtkWidget        *gcolor2;
+GtkWidget        *menu;
+GdkColor          colorvalue;
 
 GtkWidget        *savedialog;
 gchar            *colorname;
 static GtkWidget *aboutdialog = NULL;
 GtkTreeIter       selection_iter;
 
-
 /**
  * displays a simple file error dialog, where type specifies the
  * access that failed (read, write).
--- gcolor2-0.4.old/src/callbacks.h
+++ gcolor2-0.4/src/callbacks.h
@@ -41,9 +41,9 @@
                            "\302\267 Usability / user interface enhancements\n" \
                            "\302\267 Code cleanup"
 
-GtkWidget *gcolor2;
-GtkWidget *menu;
-GdkColor   colorvalue;
+extern GtkWidget *gcolor2;
+extern GtkWidget *menu;
+extern GdkColor   colorvalue;
 
 enum
 {