Matthew D. Langston <langston@SLAC.Stanford.EDU>
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. 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
cryp.to ac-archive's Installed Packages (released)
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
The four "standard" OpenGL libraries are searched for: "-lGL",
"-lGLU", "-lGLX" (or "-lMesaGL", "-lMesaGLU" as the case may be)
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.
A complete little toy "Automake `make distcheck'" package of how to
use this macro is available at:
Please note that as the ac_opengl macro and the toy example
evolves, the version number increases, so you may have to adjust
the above URL accordingly.
minor bugfix by ahmet inan <email@example.com>
AC_CACHE_CHECK([for OpenGL], mdl_cv_have_OpenGL,
dnl Check for Mesa first, unless we were asked not to.
[Prefer the Mesa library over a vendors native OpenGL library (default=yes)],
AC_ARG_ENABLE(Mesa, $with_Mesa_help_string, use_Mesa=$enableval, use_Mesa=yes)
if test x"$use_Mesa" = xyes; then
dnl If we are running under X11 then add in the appropriate libraries.
if test x"$no_x" != xyes; then
dnl Add everything we need to compile and link X programs to GL_X_CFLAGS
dnl and GL_X_LIBS.
GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu -lXt -lXi $X_EXTRA_LIBS"
# Save the "AC_MSG_RESULT file descriptor" to FD 8.
# Temporarily turn off AC_MSG_RESULT so that the user gets pretty
AC_SEARCH_LIBS(glAccum, $GL_search_list, have_GL=yes, have_GL=no)
AC_SEARCH_LIBS(gluBeginCurve, $GLU_search_list, have_GLU=yes, have_GLU=no)
AC_SEARCH_LIBS(glXChooseVisual, $GLX_search_list, have_GLX=yes, have_GLX=no)
AC_SEARCH_LIBS(glutInit, glut, have_glut=yes, have_glut=no)
# Restore pretty messages.
if test -n "$LIBS"; then
dnl Reset GL_X_LIBS regardless, since it was just a temporary variable
dnl and we don't want to be global namespace polluters.
dnl bugfix: dont forget to cache this variables, too
dnl endof bugfix -ainan