The core for the open cad platform OpenCascade can be a bit tricky to install on Linux due to the need to compile it yourself before installation (many different third party dependencies). Therefore a short step by step description for this can be found here for a clean installation of Ubuntu 18.04.

Information for other linux distributions and systems can be found in the internal dox catalogue in the git repository.

Start by opening the terminal in Ubuntu and installing general system packages needed:

sudo apt-get install software-properties-common
sudo apt-get install libtool autoconf automake gfortran gdebi
sudo apt-get install gcc-multilib libxi-dev libxmu-dev libxmu-headers
sudo apt-get install libx11-dev mesa-common-dev libglu1-mesa-dev
sudo apt-get install libfontconfig1-dev

The minimum requirements for third party dependencies to run OpenCascade itself is Freetype 2.5 and Tcl/TK 8.6.

Freetype 2.5 does not come prepackaged to Ubuntu 18.04 so it has to be downloaded and installed manually in the terminal

cd ~\Downloads

wget "https://netcologne.dl.sourceforge.net/project/freetype/freetype2/2.5.5/freetype-2.5.5.tar.gz"

tar xf freetype-2.5.5.tar.gz

cd freetype-2.5.5

configure

make

make install

Fortunately the Tcl/TK 8.6 comes as apt packages in Ubuntu 18.04 so they can be installed easily.

sudo apt-get install tcl tcl-dev tk tk-dev

Download the OpenCascade 7.4 source from the download center and place in the Downloads folder. Create a temp build folder and start the cmake wizard. Inspect suggested variables (shoud be prefilled) and start configuration with key c.

cd ~\Downloads
tar xf opencascade-7.4.0.tar.gz
mkdir tmp
cd tmp
ccmake ..\Downloads\opencascade-7.4.0

Finish up with build and install

make
make install

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