Avoid the spurious initial empty line.

[bison.git] / m4 / subpipe.m4

# -*- Autoconf -*-
# Checks required to run `subpipe'.
#
# Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# 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, see <http://www.gnu.org/licenses/>.

# Written by Paul Eggert <eggert@twinsun.com>.

AC_DEFUN([BISON_PREREQ_SUBPIPE],
[
 AC_TYPE_PID_T
 AC_HEADER_SYS_WAIT
 AC_CHECK_FUNCS(dup2 waitpid)
 AC_FUNC_FORK
])