/usr/share/aclocal/ax_check_pathfind.m4 is in autoconf-archive 20160916-1.
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# http://www.gnu.org/software/autoconf-archive/ax_check_pathfind.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_PATHFIND
#
# DESCRIPTION
#
# Not all systems have pathfind(3). See if we need to substitute. To make
# this work, you have to do horrible things. See the doc for
# AX_CHECK_STRCSPN.
#
# LICENSE
#
# Copyright (c) 2008 Bruce Korb <bkorb@gnu.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 5
AU_ALIAS([AG_CHECK_PATHFIND], [AX_CHECK_PATHFIND])
AC_DEFUN([AX_CHECK_PATHFIND],[
AC_MSG_CHECKING([whether pathfind(3) works])
AC_CACHE_VAL([ax_cv_pathfind],[
AC_TRY_RUN([#include <string.h>
#include <stdlib.h>
int main (int argc, char** argv) {
char* pz = pathfind( getenv( "PATH" ), "sh", "x" );
return (pz == 0) ? 1 : 0;
}],[ax_cv_pathfind=yes],[ax_cv_pathfind=no],[ax_cv_pathfind=no]
) # end of TRY_RUN]) # end of CACHE_VAL
AC_MSG_RESULT([$ax_cv_pathfind])
if test x$ax_cv_pathfind = xyes
then
AC_DEFINE(HAVE_PATHFIND, 1,
[Define this if pathfind(3) works])
else
if test x$ac_cv_lib_gen_pathfind = xyes
then :
else
COMPATOBJ="$COMPATOBJ pathfind.lo"
fi
fi
]) # end of AC_DEFUN of AX_CHECK_PATHFIND
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