?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 glXChooseVisual () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 ?? () __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6