Revamp lchown so that it lives in unistd.h where it belongs.

[gnulib.git] / m4 / putenv.m4

diff --git a/m4/putenv.m4 b/m4/putenv.m4
index 80abf84..43a5dc5 100644 (file)
--- a/m4/putenv.m4
+++ b/m4/putenv.m4
@@ -1,10 +1,8 @@
-# putenv.m4 serial 8
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# putenv.m4 serial 12
+dnl Copyright (C) 2002, 2003, 2004, 2005, 2006 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.
 
 dnl From Jim Meyering.
 dnl
@@ -13,25 +11,21 @@ dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
 
 AC_DEFUN([gl_FUNC_PUTENV],
 [AC_CACHE_CHECK([for SVID conformant putenv], jm_cv_func_svid_putenv,
-  [AC_TRY_RUN([
-    int
-    main ()
-    {
-      /* Put it in env.  */
-      if (putenv ("CONFTEST_putenv=val"))
-        exit (1);
+  [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[
+    /* Put it in env.  */
+    if (putenv ("CONFTEST_putenv=val"))
+      return 1;
 
-      /* Try to remove it.  */
-      if (putenv ("CONFTEST_putenv"))
-        exit (1);
+    /* Try to remove it.  */
+    if (putenv ("CONFTEST_putenv"))
+      return 1;
 
-      /* Make sure it was deleted.  */
-      if (getenv ("CONFTEST_putenv") != 0)
-        exit (1);
+    /* Make sure it was deleted.  */
+    if (getenv ("CONFTEST_putenv") != 0)
+      return 1;
 
-      exit (0);
-    }
-             ],
+    return 0;
+             ])],
             jm_cv_func_svid_putenv=yes,
             jm_cv_func_svid_putenv=no,
             dnl When crosscompiling, assume putenv is broken.
@@ -41,11 +35,5 @@ AC_DEFUN([gl_FUNC_PUTENV],
     AC_LIBOBJ(putenv)
     AC_DEFINE(putenv, rpl_putenv,
       [Define to rpl_putenv if the replacement function should be used.])
-    gl_PREREQ_PUTENV
   fi
 ])
-
-# Prerequisites of lib/putenv.c.
-AC_DEFUN([gl_PREREQ_PUTENV], [
-  AC_CHECK_HEADERS_ONCE(unistd.h)
-])