/usr/share/aclocal/ax_check_awk_array_delete_elem.m4 is in autoconf-archive 20140228-1.1.
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# http://www.gnu.org/software/autoconf-archive/ax_check_awk_array_delete_elem.html
# ==================================================================================
#
# SYNOPSIS
#
# AX_CHECK_AWK_ARRAY_DELETE_ELEM([ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
#
# DESCRIPTION
#
# Check if AWK supports delete on array element. 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_ARRAY_DELETE_ELEM], [
AX_TRY_AWK_EXPOUT([array delete element],
[],[ a[1]=1; delete a[1]; if (a[1]!=0) exit (1) ],[],
[$1],[$2])
])
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