OpenCASCADE is a software development kit (SDK) intended for development of applications dealing with 3D CAD data, freely available in open source. It includes a set of C++ class libraries providing services for 3D surface and solid modeling, visualization, data exchange and rapid application development.
Below is a short summary of instructions on how to compile and install OpenCASCADE community edition by hand (for the case you wish to do so).
Get a clone of the OCE repository:
git clone git://github.com/tpaviot/oce.gitIt is a good practice to build in a separate directory:
mkdir build
cd build
cmake -D OCE_INSTALL_PREFIX=/path/to/where/you/want/oce \
      -D OCE_TESTING=OFF \
      -D OCE_VISUALISATION=OFF \
      -D OCE_DISABLE_X11=ON \
      ..
make install
This will turn off some packages we don't need. The default package options also work, though.
    Support for OpenCASCADE will be enabled automatically if a system wide installation of OpenCASCADE can be found. To use a self compiled version, specify
    -DOPENCASCADE_DIR=/path/to/opencascade/or/oce
      
      when invoking cmake. Alternatively, you can also set an environment
      variable OPENCASCADE_DIR (valid alternatives are
      also OCC_DIR and OCE_DIR) and cmake
      will pick up this path.
    
    You can override the autodetection by manually setting
    -DDEAL_II_WITH_OPENCASCADE=OFF|ON
      .