X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/84eb0351d8be4811897c8cf62a69757ff5d14001..aa357b80f9c4582375f3cf0ed96490713b164f64:/m4/extensions.m4

diff --git a/m4/extensions.m4 b/m4/extensions.m4
index 1330503f0d..22156e068c 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -1,4 +1,4 @@
-# serial 9  -*- Autoconf -*-
+# serial 10  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
 # Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc.
@@ -67,6 +67,10 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
 #ifndef _ALL_SOURCE
 # undef _ALL_SOURCE
 #endif
+/* Enable general extensions on MacOS X.  */
+#ifndef _DARWIN_C_SOURCE
+# undef _DARWIN_C_SOURCE
+#endif
 /* Enable GNU extensions on systems that have them.  */
 #ifndef _GNU_SOURCE
 # undef _GNU_SOURCE
@@ -95,6 +99,7 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
   test $ac_cv_safe_to_define___extensions__ = yes &&
     AC_DEFINE([__EXTENSIONS__])
   AC_DEFINE([_ALL_SOURCE])
+  AC_DEFINE([_DARWIN_C_SOURCE])
   AC_DEFINE([_GNU_SOURCE])
   AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
   AC_DEFINE([_TANDEM_SOURCE])