Original SF tracker item 1183085.
While trying to configure CEGUI 0.2.0 it will disable the OpenGL renderer because of missing references to functions in the pthread library. It seems -lpthread isn't passed to the compile command for the glInterleavedArrays test. Check line 863 of the attached config.log file, and note that -lpthread _does_ get checked further up and _is_ found, just not used later.
I'm using Ubuntu Linux for amd64.