ax_check_glut
=============

Synopsis
********

     AX_CHECK_GLUT([ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])

Description
***********

Checks for GLUT. If a valid GLUT implementation is found, the configure script would export the C preprocessor symbol "HAVE_GLUT=1".

If either a valid GLUT header or library was not found, by default the configure script would exit on error. This behavior can be overwritten by providing a custom "ACTION-IF-NOT-FOUND" hook.

If the header, library was found, and been tested for compiling and linking the configuration would export the required compiler flags to "GLUT_CFLAGS" and "GLUT_LIBS" environment variables. These two variables can also be overwritten by defining the environment variables before executing the configure program. If it was predefined, configure would not try to overwrite it, but it would still perform the compile and link test. Only when the tests succeeded does the configure script to export "HAVE_GLUT=1" and to run "ACTION-IF-FOUND" hook.

If user didn't specify the "ACTION-IF-FOUND" hook, the configuration would prepend "GLUT_CFLAGS" and "GLUT_LIBS" to "CFLAGS" and "LIBS", like many other autoconf macros do.

If the header "GL/glut.h" is found, "HAVE_GL_GLUT_H" is defined. If the header "GLUT/glut.h" is found, HAVE_GLUT_GLUT_H is defined.

You should use something like this in your headers:

       # if HAVE_WINDOWS_H && defined(_WIN32)
       #  include <windows.h>
       # endif
       # if defined(HAVE_GL_GLUT_H)
       #  include <GL/glut.h>
       # elif defined(HAVE_GLUT_GLUT_H)
       #  include <GLUT/glut.h>
       # else
       #  error no glut.h
       # endif

On the OSX platform, you can use the option --with-xquartz-gl to use X11/Xquartz GLUT implementation instead of the system built in GLUT framework.

Source Code
***********

Download the latest version of ax_check_glut.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_check_glut.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_check_glut.m4).

License
*******

Copyright © 2009 Braden McDaniel braden@endoframe.com
 Copyright © 2013 Bastien Roucaries roucaries.bastien+autoconf@gmail.com
 Copyright © 2016 Felix Chern idryman@gmail.com

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 2 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.