Vavoom is a highly modified Doom/Heretic/Hexen/Strife engine borrowing
many ideas (and many pieces of code) from the Quake games/code. 
Features such as 3D floors (room-over-room), ZDoom map format support,
EDGE map format support, BOOM compatibility, console, jumping, revamped
menus, overhauled client/server networking (in-game joining support),
OpenGL rendering, dynamic lighting, and more.

Vavoom requires a data file from at least one of the following:
- Doom shareware, Registered Doom, Ultimate Doom
- Doom 2: Hell on Earth, Doom 2: TNT Evilution,
  Doom 2: The Plutonia Experiment
- Heretic shareware, Heretic registered
- Hexen
- Strife shareware, Strife

cp(1) or ln(1) symlink the main data file(s) from any of the above into
${PREFIX}/share/vavoom to play the games.

The following parameters are accepted to start a specific game if all
data files are present: -doom, -doom2, -tnt, -plutonia, -heretic,
-hexen, -strife