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# ===========================================================================
# http://www.nongnu.org/autoconf-archive/ax_path_missing.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PATH_MISSING(VARIABLE, PROG-TO-CHECK-FOR, WARNING-IF-NOT-FOUND, PATH)
#
# DESCRIPTION
#
# Check whether program PROG-TO-CHECK-FOR exists in path. If it is found,
# set VARIABLE to the full path of PROG-TO-CHECK-FOR, otherwise warn using
# the string WARNING-IF-NOT-FOUND and set VARIABLE to the full path of the
# Automake missing script with PROG-TO-CHECK-FOR as the command to run.
#
# A typical use is the following:
#
# AX_PATH_MISSING([AUTOGEN],[autogen],[autogen seems missing ...])
#
# This macro is the combination of AC_PATH_PROG and AX_MISSING_PROG. If
# you do not want to run AC_PATH_PROG, simply use AX_MISSING_PROG or
# AM_MISSING.
#
# LICENSE
#
# Copyright (c) 2008 Noah Slater <nslater@bytesexual.org>
# Copyright (c) 2008 Francesco Salvestrini <salvestrini@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.
AC_DEFUN([AX_PATH_MISSING], [
AC_PATH_PROG([$1],[$2],[$4])
AS_IF([ test -z "${$1}" ],[
unset $1
AX_MISSING_PROG([$1],[$2],[$3])
])
])
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