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--- a2ps-4.13/src/main.c.gnusource	2003-10-17 17:07:05.000000000 +0100
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+++ a2ps-4.13/src/main.c	2003-10-17 17:07:17.000000000 +0100
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@@ -30,6 +30,7 @@
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 /*                      I n c l u d e   f i l e s                       */
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 /*                                                                      */
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 /************************************************************************/
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+#define _GNU_SOURCE
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 #include <assert.h>
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 #include <string.h>
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 #include <langinfo.h>
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@@ -105,7 +106,6 @@
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    defined twice, see lib/confg.gperf, handling of `Options:'. */
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 char *program_name;
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-const char *program_invocation_name;
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 /* Stores the data of liba2ps.  */
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