Remove broken detection of OpenGL and GLEW.  See
<http://sourceforge.net/tracker/?func=detail&aid=3015936&group_id=61223&atid=496518>.

--- tulip-3.3.1/acinclude.m4	2010-01-18 20:34:02.000000000 +0100
+++ tulip-3.3.1/acinclude.m4	2010-06-14 16:25:25.000000000 +0200
@@ -353,68 +353,8 @@ AC_ARG_WITH(gl-libraries,
     [  ac_gl_libraries="$withval"
     ])
 
-AC_CACHE_VAL(ac_cv_have_gl,
-[
-if test ${VAR_WIN32} = 1
-then
-gl_incdirs=" /mingw/include $ac_gl_includes $GLDIR/include /usr/include /usr/X11R6/include/X11 /usr/X11R6/include $x_includes "
-else
-gl_incdirs=" $ac_gl_includes $GLDIR/include /usr/include /usr/X11R6/include/X11 /usr/X11R6/include $x_includes "
-fi
-AC_FIND_FILE(GL/gl.h, $gl_incdirs, gl_incdir)
-ac_gl_includes="$gl_incdir"
-
-if test ${VAR_WIN32} = 1
-then
-gl_libdirs="$GLDIR $ac_gl_libraries $GLLIB /usr/X11R6/lib /usr/lib /usr/local/lib $x_libraries "
-else
-gl_libdirs="$ac_gl_libraries $GLLIB /usr/X11R6/lib64 /usr/lib64 /usr/local/lib64/usr/X11R6/lib /usr/lib /usr/local/lib $x_libraries "
-fi
-
-test -n "$GLDIR" && gl_libdirs="$GLDIR/lib64 $GLDIR/lib $GLDIR $gl_libdirs"
-test=NONE
-gl_libdir=NONE
-for dir in $gl_libdirs; do
-if test ${VAR_WIN32} = 1
-then
-  try="ls -1 $dir/*opengl*"
-else
-  try="ls -1 $dir/libGL*"
-fi
-  if test=`eval $try 2> /dev/null`; then 
-    gl_libdir=$dir
-    if test ${VAR_WIN32} = 0 ; then 	 
-      try="ls -1 $gl_libdir/libGLEW.*" 	 
-      if test=`eval $try 2> /dev/null`; then break; else AC_MSG_ERROR([ libGLEW not found , please install it in $gl_libdir ]); fi 	 
-    else 	 
-      break 	 
-    fi
-  else 
-    echo "tried $dir" >&AC_FD_CC
-  fi
-done
-ac_gl_libraries="$gl_libdir"
 ])
 
-eval "$ac_cv_have_gl"
-if test "$ac_gl_libraries" = NONE; then
-  AC_MSG_ERROR([ Not found , put your GLDIR environnement variable to the OpenGL directory ]);
-else
-  ac_cv_have_gl="have_gl=yes \
-  ac_gl_includes=$ac_gl_includes ac_gl_libraries=$ac_gl_libraries"
-  AC_MSG_RESULT([ libraries $ac_gl_libraries, headers $ac_gl_includes ])  
-  gl_libraries="$ac_gl_libraries"
-  gl_includes="$ac_gl_includes"
-if test ${VAR_MACOSX} = 1
-then
-  GL_INCLUDES="-I$ac_gl_includes"
-  GL_LDFLAGS=""
-else
-  GL_INCLUDES="-I$ac_gl_includes"	
-  GL_LDFLAGS="-L$ac_gl_libraries"
-fi
-fi
-
 dnl MAC PORT
 if test ${VAR_MACOSX} = 1
 then