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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_emacs.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_EMACS
#
# DESCRIPTION
#
# This macro allows the end user to specify a particular Emacs executable
# via a configure script command-line arg. For example:
#
# ./configure EMACS=$HOME/build/GNU/emacs/src/emacs
#
# It also arranges to mention env var EMACS in the './configure --help'
# output. See info node "(autoconf) Generic Programs" for details.
#
# More precisely...
#
# If env var EMACS is set, try to use its value directly, but avoid
# getting fooled by value 't' (set by older Emacsen for subprocesses). If
# no joy from the environment, search for "emacs" via AC_CHECK_PROG. If
# still no joy, display "Emacs not found; required!" and make configure
# exit failurefully. Otherwise, set shell var EMACS and AC_SUBST it, too.
#
# LICENSE
#
# Copyright (c) 2016-2017 Thien-Thi Nguyen
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 2
AC_DEFUN([AX_PROG_EMACS],[dnl
AC_ARG_VAR([EMACS],[Use this Emacs to byte-compile the Emacs Lisp files.])
dnl Allow env override but do not get fooled by 'EMACS=t'.
test t = "$EMACS" && unset EMACS
dnl The next line does nothing if var 'EMACS' is already set.
AC_CHECK_PROG([EMACS], [emacs], [emacs])
AS_IF([test "x$EMACS" = x],[AC_MSG_ERROR([Emacs not found; required!])])
])dnl
dnl ax_prog_emacs.m4 ends here
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