How to create cmakelists.txt file to build pmars game?

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Linux

Is it spelled correctly?:

cmake_minimum_required (VERSION 2.6)
project (Pmars)
add_executable(Pmars pmars-0.9.2.cxx)

What do I need to add further?

What I have tried:

I am trying to build a game pmars-0.9.2 on Ubuntu 18.04.3 LTS i just did not have the only component of the Gmock assembly and the CMakeLists.txt file attached to it. I originally read the Cmake manual of the build sequence at https://cmake.org/cmake-tutorial/ and am now trying to write it gradually. Is there anyone who can help me finish the rest of the file steps? Has anyone already compiled pmars?