It seems the updated ebuild on sci overlay is already ported Thanks
commit 40cb9fa5d72e46893c9c13da1cc0f66aecd18b86 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Mon Feb 20 16:47:00 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Mon Feb 20 16:51:33 2017 sci-biology/wgs-assembler: Remove 'unused' python eclass While the package checks for Python interpreter + headers, the check is broken and fails anyway. Furthermore, the relevant component seems no longer to be a part of the package. Well, not exactly a port but killed the old eclass nevertheless ;-).