On Linux:

$ sudo apt-get install -y build-essential wget libgmp-dev libcdd-dev m4
$ mkdir topcom && cd topcom && mkdir source && mkdir install
$ cd install && export topcompath=$PWD && cd ..
$ cd source && wget https://www.wm.uni-bayreuth.de/de/team/rambau_joerg/TOPCOM-Downloads/TOPCOM-0_17_8.tgz
$ tar -xzf TOPCOM-0_17_8.tgz && cd topcom-0.17.8
$ ./configure --prefix=$topcompath && make -j4 && make install

After this, the bin, lib and include folders for TOPCOM could be found under topcompath. The paths to these folders could be prepended to the environment variables PATH, LD_LIBRARY_PATH and CPATH in the ~/.bashrc file, so as to ensure that TOPCOM executables such as points2triangs or points2ntriangs could be called from any directory using the login-shell, as long as a single-user installation is concerned.

On MacOS:
First, install brew from homebrew. After that, one can follow the same set of steps as given for Linux, with the difference being only in the very first step:

% brew install gcc cddlib gmp m4

The rest of the steps are again similar to those for Linux, including the names of the environment variables, with the difference being that in most modern Macs, the default login-shell is not bash but rather zsh. So the paths need to be set in the ~/.zshrc file, accordingly.