Hi everyone: I'm Weiwen Chen from Fudan University and I'm working on adding `robocopy.exe` into wine. I stage my work on my github fork <https://github.com/ofey404/wine/tree/robocopy>. This program accepts complex command line arguments, so I'm trying to implement my own `getopt` function which accepts dos-style flags(beginning with slash, like `/x`). The dummy code is under programs/robocopy <https://github.com/ofey404/wine/tree/robocopy/programs/robocopy> directory. And I want to add some unittest of `getopt_long()`, in robocopy/tests/getopt.c <https://github.com/ofey404/wine/blob/fe4a71850b023eefadab5ce357ce4671c1fffc72/programs/robocopy/tests/getopt.c#L21>. I try to import my source code of `getopt.c` relatively into unit test file, but I failed with error message like this: ../wine-git/programs/robocopy/tests/getopt.c:20: error: #include directive with relative path not allowed How can I include my source file correctly into the test? Maybe I should configure something in the `configure` script, but I don't know how to do it. I've read some of the builtin programs, but they seldom have a separate `test/` directory, and I don't find examples of unit tests. Wish you all the best Weiwen Chen