On Mon May 13, 2024 at 12:43 PM EEST, Mirsad Todorovac wrote: > Thanks for your explanation. > > I did not realise that __USE_GNU is evil. :-/ It's not "evil" IMHO. It is not just part of defined API :-) Thus the official man pages are your friend. > > FWIW, there is a sound explanation of the difference between > _GNU_SOURCE and __USE_GNU > here: https://stackoverflow.com/questions/7296963/gnu-source-and-use-gnu > > Thanks, > Mirsad BR, Jarkko