On 2020/04/30 19:58, Guillem Jover <guil...@debian.org> wrote: > I assume then that your linux-libc-dev is older than 5.1, which is > when that header got introduced? Are you building in testing/sid?
True, my linux-libc-dev is 4.19.98-1. If the package requires at least version 5.1, then it should declare exactly that in the "Depends" line.