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--- xlunch.c.orig 2017-05-17 21:38:59.048445309 -0500
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+++ xlunch.c 2017-05-17 21:39:41.334944291 -0500
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@@ -27,6 +27,9 @@
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#include <sys/file.h>
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#include <errno.h>
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+/* file I/O stuff */
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+#include <fcntl.h>
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+
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/* some globals for our window & X display */
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Display *disp;
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Window win;
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