Description of problem: The bootstrap script should warn on stderr if executed on a system that is not supported (uname or /etc/issue check? nothing too elaborate). current support is for Ubuntu 16.04.0 and RHEL 7.2 — it does not help to be too precise here, I would just check we are on 16.04 and RHEL 7 in a broad sense... this is a "Gentoo is not supported" warning, not a supportability statement on exact minor versions.
*** This bug has been marked as a duplicate of bug 1310214 ***