diff -ru a2ps-4.13.old/src/main.c a2ps-4.13/src/main.c
--- a2ps-4.13.old/src/main.c	2006-10-09 13:43:03 +0400
+++ a2ps-4.13/src/main.c	2006-10-09 13:43:28 +0400
@@ -30,6 +30,7 @@
 /*                      I n c l u d e   f i l e s                       */
 /*                                                                      */
 /************************************************************************/
+#define _GNU_SOURCE 1
 #include <assert.h>
 #include <string.h>
 #include <locale.h>
@@ -104,7 +105,6 @@
    defined twice, see lib/confg.gperf, handling of `Options:'. */
 
 char *program_name;
-const char *program_invocation_name;
 
 /* Stores the data of liba2ps.  */