请教各高手,glxgears出故障?

执行命令,看不到齿轮只出现如下信息

[root@localhost ~]# glxgears
Xlib:  extension "GLX" missing on display ":0.0".
glxgears: Error: couldn't get an RGB, Double-buffered visual.

请教高手,如何恢复正常啊?