ax_have_opengl
==============

Synopsis
********

     AX_HAVE_OPENGL

Description
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Search for OpenGL. We search first for Mesa (a GPL'ed version of Mesa) before a vendor's version of OpenGL, unless we were specifically asked not to with `--with-Mesa=no' or `--without-Mesa'.

The four "standard" OpenGL libraries are searched for: "-lGL", "-lGLU", "-lGLX" (or "-lMesaGL", "-lMesaGLU" as the case may be) and "-lglut".

All of the libraries that are found (since "-lglut" or "-lGLX" might be missing) are added to the shell output variable "GL_LIBS", along with any other libraries that are necessary to successfully link an OpenGL application (e.g. the X11 libraries). Care has been taken to make sure that all of the libraries in "GL_LIBS" are listed in the proper order.

Additionally, the shell output variable "GL_CFLAGS" is set to any flags (e.g. "-I" flags) that are necessary to successfully compile an OpenGL application.

The following shell variable (which are not output variables) are also set to either "yes" or "no" (depending on which libraries were found) to help you determine exactly what was found.

       have_GL
       have_GLU
       have_GLX
       have_glut

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

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

License
*******

Copyright © 2008 Matthew D. Langston
 Copyright © 2008 Ahmet Inan auto@ainan.org
 Copyright © 2013 Bastien Roucaries <roucaries.bastien+autoconf@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 <http://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.