-# putenv.m4 serial 19
-dnl Copyright (C) 2002-2012 Free Software Foundation, Inc.
+# putenv.m4 serial 20
+dnl Copyright (C) 2002-2014 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.
;;
esac
])
+
+# Prerequisites of lib/putenv.c.
+AC_DEFUN([gl_PREREQ_PUTENV],
+[
+ AC_CHECK_DECLS([_putenv])
+])