PrBoom, the purest Doom-Port? Aims to be the most stable Doom port
with the highest compatibility to the major Doom versions and highres
software rendering. Full Boom and most if not all MBF features.

The prboom.wad found in the source tree is required to play prboom,
place it in the content directory with the other doom wads.

To build the debugging symbols use:
  DEBUG=1 ./libretro-prboom.SlackBuild