sacha@coco:~/git/mesa/progs/xdemos$ ./texture_from_pixmap
GLX_EXT_texture_from_pixmap not supported.
sacha@coco:~/git/mesa/progs/xdemos$ LIBGL_ALWAYS_INDIRECT=1 ./texture_from_pixmap
Unable to find FBconfig for texturing
sacha@coco:~/git/mesa/progs/xdemos$ glxinfo | grep conf
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group