On Wed, 2022-11-02 at 16:22 -0400, Jeffrey Walton wrote: > A first class configure test that checks for the size of time_t will > probably be your best choice.
Unfortunately we don't (always) run configure on Windows (it's possible to build GNU make on Windows systems where you can't run configure because you don't have a POSIX environment). So, a configure check isn't the best choice. We'd prefer a preprocessor test that can detect this situation.