-# pipe.m4 serial 1
-dnl Copyright (C) 2004 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.
+# pipe.m4 serial 2
+dnl Copyright (C) 2010-2011 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.
-AC_DEFUN([gl_PIPE],
+AC_DEFUN([gl_FUNC_PIPE],
[
- dnl Prerequisites of lib/pipe.h.
- AC_CHECK_HEADERS_ONCE(unistd.h)
- dnl Prerequisites of lib/pipe.c.
- AC_REQUIRE([AC_C_INLINE])
- AC_REQUIRE([AC_TYPE_MODE_T])
- AC_REQUIRE([AC_FUNC_FORK])
- AC_CHECK_FUNCS(posix_spawn)
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+ AC_CHECK_FUNCS_ONCE([pipe])
+ if test $ac_cv_func_pipe != yes; then
+ HAVE_PIPE=0
+ fi
])