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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.

Source Code

Download the latest version of ax_prog_emacs.m4 or browse the macro’s revision history.


Copyright © 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 <>.

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.

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