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diff -up cups-1.5b1/scheduler/auth.c.peercred cups-1.5b1/scheduler/auth.c
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--- cups-1.5b1/scheduler/auth.c.peercred	2011-05-20 05:49:49.000000000 +0200
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+++ cups-1.5b1/scheduler/auth.c	2011-05-23 18:00:18.000000000 +0200
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@@ -52,6 +52,7 @@
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  * Include necessary headers...
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  */
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+#define _GNU_SOURCE
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 #include "cupsd.h"
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 #include <grp.h>
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 #ifdef HAVE_SHADOW_H