To run the tests: cd ../Unix make test 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 update the submodule via git submodule init git submodule update issued within your cloc working directory to get the tests to pass. The submodule will populate the directory tests/inputs/issues/131/cloc_submodule_test/