Import upstream version 1.29

[debian/tar] / m4 / environ.m4

diff --git a/m4/environ.m4 b/m4/environ.m4
index b9dc2ef27e543825c4b1c4aae1309b186b009594..4dbf9473e149ec1afdacb416f376f86c8144d63d 100644 (file)
--- a/m4/environ.m4
+++ b/m4/environ.m4
@@ -1,5 +1,5 @@
-# environ.m4 serial 5
-dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc.
+# environ.m4 serial 6
+dnl Copyright (C) 2001-2004, 2006-2015 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,7 +9,16 @@ AC_DEFUN_ONCE([gl_ENVIRON],
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   dnl Persuade glibc <unistd.h> to declare environ.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
+
+  AC_CHECK_HEADERS_ONCE([unistd.h])
+  gt_CHECK_VAR_DECL(
+    [#if HAVE_UNISTD_H
+     #include <unistd.h>
+     #endif
+     /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
+     #include <stdlib.h>
+    ],
+    [environ])
   if test $gt_cv_var_environ_declaration != yes; then
     HAVE_DECL_ENVIRON=0
   fi