portability: fix spawning on at least FreeBSD 8 and FreeBSD 9.

[bison.git] / m4 / subpipe.m4

diff --git a/m4/subpipe.m4 b/m4/subpipe.m4
index 5d6a8c4a078a59bf4805b24b84da2c0871ae8b63..774a8ab7a08c05e1e2b78b1c8c0c54d4d155d174 100644 (file)
--- a/m4/subpipe.m4
+++ b/m4/subpipe.m4
@@ -1,11 +1,12 @@
 # -*- Autoconf -*-
 # Checks required to run `subpipe'.
 #
-# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# Copyright (C) 2002-2003, 2005, 2009-2010 Free Software Foundation,
+# Inc.
 #
-# This program is free software; you can redistribute it and/or modify
+# This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
@@ -14,16 +15,13 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-# 02111-1307  USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Written by Paul Eggert <eggert@twinsun.com>.
 
 AC_DEFUN([BISON_PREREQ_SUBPIPE],
 [
  AC_TYPE_PID_T
- AC_CHECK_HEADERS([fcntl.h])
  AC_HEADER_SYS_WAIT
  AC_CHECK_FUNCS(dup2 waitpid)
  AC_FUNC_FORK