Radiant 3.2: "Application calling GLX 1.3 function "glXCreatePbuffer" when GLX 1.3 is not supported! This is an application bug!"

Radiant 3.2: "Application calling GLX 1.3 function "glXCreatePbuffer" when GLX 1.3 is not supported! This is an application bug!"

Description:
When Radiant 3.2 is release, a new system lib is introduced by adding Qt libqxcb-glx-integration.so in <radiant install path>/lscc/radiant/3.2/bin/lin64. This will cause an error when launching Radiant on Linux:

 "Application calling GLX 1.3 function "glXCreatePbuffer" when GLX 1.3 is not supported! This is an application bug!"

Solution:

1. Try to install mesa drivers: 
$ sudo apt-get install libgl1-mesa-dri

2. If #1 does not work, try to use the variable below before running Radiant:
export QMLSCENE_DEVICE=softwarecontext