Textures are missing in game
If you run the game and all of textures you see are black and gray it's mean you don't have the S3 texture compression library installed. This may occur if you're running with the open source OpenGL implementation called Mesa that does not include EXT_texture_compression_s3tc extension due to patent issues.
You need to install the S2TC library that provides support for texture compression.
- Debian-based include Ubuntu and other derivatives, install package called "libtxc-dxtn-s2tc0"
- RPM-based like Fedora, OpenSuse, install package called "libtxc_dxtn"
- For any other distribution, check distribution wiki about S3TC / DXTn.