OpenCASCADE is a software development platform freely available in open
source. It includes components for 3D surface and solid modelling,
visualization, data exchange and rapid application development.

NOTE: This package needs about 2.5GB of space to build, so adapt your
OUTPUT / TMP variables if necessary.

FreeImage, tbb and gl2ps are optional dependencies.

* To build with FreeImage support, use the option  FREEIMAGE=yes
* To build with tbb support, use the option        TBB=yes
* To build with gl2ps support, use the option      GL2PS=yes

For example:
  TBB=yes ./OpenCASCADE.SlackBuild