1# pipe.m4 serial 2 2dnl Copyright (C) 2010-2022 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_PIPE], 8[ 9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) 10 11 AC_CHECK_FUNCS_ONCE([pipe]) 12 if test $ac_cv_func_pipe != yes; then 13 HAVE_PIPE=0 14 fi 15]) 16