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##### http://autoconf-archive.cryp.to/ax_with_prog.html
#
# SYNOPSIS
#
# AX_PROG_WITH([VARIABLE],[program],[PATH],[VALUE-IF-NOT-FOUND])
#
# DESCRIPTION
#
# Locates an installed program binary, placing the result in the
# precious variable VARIABLE. Accepts a present VARIABLE, then
# --with-program, and failing that searches for program in the given
# path (which defaults to the system path). If program is found,
# VARIABLE is set to the full path of the binary; if it is not found,
# VARIABLE is set to VALUE-IF-NOT-FOUND, which defaults to 'program'.
#
# A typical example could be the following one:
#
# AX_WITH_PROG(PERL,perl)
#
# NOTE: This macro is based upon the original AX_WITH_PYTHON macro
# from Dustin J. Mitchell <dustin@cs.uchicago.edu>.
#
# LAST MODIFICATION
#
# 2008-01-29
#
# COPYLEFT
#
# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
# Copyright (c) 2008 Dustin J. Mitchell <dustin@cs.uchicago.edu>
#
# 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_WITH_PROG],[
AC_PREREQ([2.59])
pushdef([VARIABLE],$1)
pushdef([EXECUTABLE],$2)
pushdef([PATH_PROG],$3)
pushdef([VALUE_IF_NOT_FOUND],$4)
AC_ARG_VAR(VARIABLE,Absolute path to EXECUTABLE executable)
AS_IF(test -z "$VARIABLE",[
AC_MSG_CHECKING(whether EXECUTABLE executable path has been provided)
AC_ARG_WITH(EXECUTABLE,AS_HELP_STRING([--with-EXECUTABLE=[[[[PATH]]]]],absolute path to EXECUTABLE executable), [
AS_IF([test "$withval" != "yes"],[
VARIABLE="$withval"
AC_MSG_RESULT($VARIABLE)
],[
VARIABLE=""
AC_MSG_RESULT([no])
])
],[
AC_MSG_RESULT([no])
])
AS_IF(test -z "$VARIABLE",[
AC_PATH_PROG([]VARIABLE[],[]EXECUTABLE[],[]VALUE_IF_NOT_FOUND[],[]PATH_PROG[])
])
])
popdef([VALUE_IF_NOT_FOUND])
popdef([PATH_PROG])
popdef([EXECUTABLE])
popdef([VARIABLE])
])
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