/usr/share/aclocal/ax_check_awk_user_defined_functions.m4 is in autoconf-archive 20140228-1.1.
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# http://www.gnu.org/software/autoconf-archive/ax_check_awk_user_defined_functions.html
# =======================================================================================
#
# SYNOPSIS
#
# AX_CHECK_AWK_USER_DEFINED_FUNCTIONS([ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
#
# DESCRIPTION
#
# Check if AWK supports user defined functions. If successful execute
# ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
#
# This work is heavily based upon testawk.sh script by Heiner Steven. You
# should find his script (and related works) at
# <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to
# Alessandro Massignan for his suggestions and extensive nawk tests on
# FreeBSD.
#
# LICENSE
#
# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
# 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 8
AC_DEFUN([AX_CHECK_AWK_USER_DEFINED_FUNCTIONS],[
AC_REQUIRE([AX_NEED_AWK])
AC_MSG_CHECKING([if $AWK supports user defined functions])
ax_awk_command=`echo "" | $AWK 'function mydouble(x) { return 2*x ; } ; { print mydouble(1) ; }' 2> /dev/null`
AS_IF([test $? -eq 0],[
AS_IF([test X"$ax_awk_command" = X"2"],[
AC_MSG_RESULT([yes])
$1
],[
AC_MSG_RESULT([no])
$2
])
],[
AC_MSG_RESULT([no])
$2
])
])
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