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diff -Naur src.orig/wmgeneral.h src/wmgeneral.h
--- src.orig/wmgeneral.h 2002-10-19 11:33:41.000000000 +0200
+++ src/wmgeneral.h 2020-03-01 16:22:30.891485480 +0100
@@ -36,7 +36,7 @@
/* Global variable */
/*******************/
-Display *display;
+extern Display *display;
/***********************/
/* Function Prototypes */
diff -Naur src.orig/wmpuzzle.c src/wmpuzzle.c
--- src.orig/wmpuzzle.c 2013-06-27 20:42:26.000000000 +0200
+++ src/wmpuzzle.c 2020-03-01 16:22:28.716484905 +0100
@@ -41,6 +41,8 @@
int blank = 15,
puzzle[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+Display *display;
+
int main(int argc, char *argv[])
{
int n,
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