Created attachment 440274 [details] example failing build log Due to usage of certain mechanics in Perl that were changed with Perl 5.20 COW-ification, cache-mmap now produces SEGV's instead of mmapping a file. Last upstream release is dated 2008, and there's nothing in tree using it.
commit 1d5ceec005e958045652723d7f93930f1c987777 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Wed Aug 10 18:12:14 2016 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Wed Aug 10 18:16:39 2016 dev-perl/cache-mmap: Remove last-rited pkg, #588528