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diff -up cups-1.3.5/scheduler/auth.c.peercred cups-1.3.5/scheduler/auth.c
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--- cups-1.3.5/scheduler/auth.c.peercred	2008-02-05 16:52:20.000000000 +0000
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+++ cups-1.3.5/scheduler/auth.c	2008-02-05 18:20:06.000000000 +0000
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@@ -54,6 +54,7 @@
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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