doc: use ASCII in .texi files where UTF-8 isn't needed

[gnulib.git] / m4 / pipe.m4

diff --git a/m4/pipe.m4 b/m4/pipe.m4
index 0e5af62..d3532d5 100644 (file)
--- a/m4/pipe.m4
+++ b/m4/pipe.m4
@@ -1,18 +1,15 @@
-# 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) 2010-2014 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.
 
-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
 ])