CentOS: Remote SSH libGL error: failed to load swrast driver

While I was trying to load up some GUI apps from remote SSH server with X11 forwarding and the error pops up:

libGL error: failed to load driver: swrast

To debug it, try the following command:

$ LIBGL_DEBUG=verbose glxinfo | grep renderer

Clearly, this is an openGL issue over SSH remote client. After searching many posts around on the forums, there is one promising solution found here.

Simply export an variable in SSH terminal solves the issue:

$ export LIBGL_ALWAYS_INDIRECT=1