The static build fails as it tries to copy a non-existent shared lib. Attached patch fixes it and a patch for the ebuild for freemint too.
Created attachment 228879 [details] fix static build This has been submitted upstream to their mailing list and has been flagged to be fixed in the next release.
Created attachment 228881 [details, diff] ebuild patch for zlib 1.2.5 & FreeMiNT
committed, thanks
FYI: the patch seems to break shared libs installation (it doesn't install them any more), so I made it conditional for MiNT. I hope upstream applies something sane.