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https://lists.gnu.org/archive/html/bug-gnulib/2015-02/msg00079.html
From: Margaret Lewicka <address@hidden>
---
lib/error.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/lib/error.c b/lib/error.c
index 6683197..36a3db7 100644
--- gnulib/lib/error.c
+++ gnulib/lib/error.c
@@ -113,9 +113,13 @@ int strerror_r ();
# endif
# endif
+#if defined __APPLE__ && defined __MACH__
+#define program_name (((char **)*_NSGetArgv())[0])
+#else
/* The calling program should define program_name and set it to the
name of the executing program. */
extern char *program_name;
+#endif
# if HAVE_STRERROR_R || defined strerror_r
# define __strerror_r strerror_r
--
2.1.0
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