glBSP is a node builder specially designed for OpenGL ports of the DOOM game engine. It adheres to the "GL-Nodes Specification", which means it adds some new special lumps to a WAD file that makes it easy and fast for an OpenGL DOOM engine to compute the polygons needed for drawing the levels. There are many DOOM ports that understand the GL-Nodes which glBSP creates, including: EDGE, the Doomsday engine (JDOOM), PrBoom, Legacy 2.0, Vavoom, Doom3D and ZDoomGL. This script builds both the command-line (glbsp) and GUI (glBSPX) binaries of glBSP. The GUI requires fltk (available at slackbuilds.org). If you don't need the GUI and/or don't want to install fltk, "export OMIT_GUI=yes" in the build script's environment. The package also includes a C header and a library (what would be known as libglbsp-dev on other Linux distributions). By default, a dynamic library is created. This works on x86 and x86_64 systems, but is untested on others. If you have trouble with the shared library, "export STATIC=yes" in the build script's environment (and please contact the maintainer of this SlackBuild!)