[PATCH] Fix non-Linux builds

[Michael Tokarev]

04.11.2022 19:49, Michael Tokarev wrote:
> From: Samuel Thibault <samuel.thibault at ens-lyon.org>
> 
> Some features are Linux-only.

And this is what's left from the patch by Samuel sent in October -
only the actual source changes.  Maybe some bits could be done
in a more compact way, with less ifdeffery.

/mjt