This is an improved version of Warzone 2100, a 3D science fiction 
real time strategy game developed by Pumpkin Studios and published 
by Eidos Interactive in 1999. 
 
Warzone 2100 offers campaign, tutorial, multi-player and single-player 
skirmish game modes, unit designer, unit experience system, and everything 
you would expect from a modern RTS game.  

Warzone 2100 requires physfs and OpenAL (both available at SlackBuilds.org).