To run the tests: cd ../Unix make test Unless you see a clear error message, all tests have been executed successfully. Tests 21 through 24 in t/01_opts.t exercise cloc's ability to work with git submodules (specifically, to ignore code in these). If you're working with a git repo clone you will need to clone the submodule via cd ../Unix git clone https://github.com/AlDanial/cloc_submodule_test.git If the directory already exists, then update by git pull