diff -Naur wmpop3-0.5.6a.orig/wmgeneral/wmgeneral.c wmpop3-0.5.6a/wmgeneral/wmgeneral.c
--- wmpop3-0.5.6a.orig/wmgeneral/wmgeneral.c	1999-08-13 17:56:19.000000000 +0200
+++ wmpop3-0.5.6a/wmgeneral/wmgeneral.c	2020-06-13 11:00:02.036999257 +0200
@@ -67,6 +67,7 @@
 GC			NormalGC;
 XpmIcon		wmgen;
 Pixmap		pixmask;
+Display		*display;
 
   /*****************/
  /* Mouse Regions */
diff -Naur wmpop3-0.5.6a.orig/wmgeneral/wmgeneral.h wmpop3-0.5.6a/wmgeneral/wmgeneral.h
--- wmpop3-0.5.6a.orig/wmgeneral/wmgeneral.h	1999-08-13 17:56:19.000000000 +0200
+++ wmpop3-0.5.6a/wmgeneral/wmgeneral.h	2020-06-13 10:59:57.263995472 +0200
@@ -36,7 +36,7 @@
  /* Global variable */
 /*******************/
 
-Display		*display;
+extern Display		*display;
 
   /***********************/
  /* Function Prototypes */