Thank you. I don't understand why this is even being debated.
Conformance statement for El Capitan: http://www.opengroup.org/csq/repository/RID=apple%25252FXY1%...
Conformance statement for El Capitan: http://www.opengroup.org/csq/repository/RID=apple%25252FXY1%...
Today there are only "Unix-like" and UNIX certified systems left. And I bet it wouldn't be too hard to certify MS Windows with SFU installed, as a UNIX.