Due to a flag `-z' that is not present in Apple's ld(1), screen (or rather its econf) fails. This patch also changes -DPTYGROUP=5 to -DPTYGROUP=4 in the ebuild which makes the compiler happy and probably those who understand why as well. With this patch, screen builds and runs and just works. :) Reproducible: Always Steps to Reproduce: Attachment of the patch follows.
Created attachment 69956 [details, diff] Patch to have screen build on OS X
Reassigning to the ppc-macos team
Maybe you'd want to check for the ppc-macos use flag instead of the userland_Darwin use flag in both cases.
No, because its required on more than Mac OS running on ppc, also applies to x86,ppc,ppc64 darwin and OS X
this has been fixed in the meanwhile afaict