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--- a/xutils.h
+++ b/xutils.h
@@ -18,11 +18,11 @@
 /*
  *   Global variable
  */
-Display		*display;
-Window          Root;
-Window          iconwin, win;
-int             screen; 
-int             DisplayDepth;
+extern Display		*display;
+extern Window          Root;
+extern Window          iconwin, win;
+extern int             screen; 
+extern int             DisplayDepth;
 
 
 
--- a/xutils.c
+++ b/xutils.c
@@ -42,6 +42,15 @@
 #include "xutils.h"
 
 
+/*
+ *   Global variable
+ */
+Display		*display;
+Window          Root;
+Window          iconwin, win;
+int             screen; 
+int             DisplayDepth;
+
 
 /*
  *   X11 Variables