Linux app fails: No matching fbConfigs or visuals found

[Yuri]

I am trying to create a port for one linux binary. It uses opengl, but 
the process fails:
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

USES=linux:c6
USE_LINUX=gtk2 dri png xorglibs

When I look at linux-telegram-desktop, it also uses 'USE_LINUX=dri' for 
OpenGL and nothing else, and it is supposed to work.

Why does it ask for swrast in my case?


Thanks,
Yuri