The ebuild uses check for IPV6 kernel option that is fatal if no compiled kernel is present. As per documentation in linux-info.eclass this should be done only if the build would fail anyway, but this is not the case. When I change the ebuild so it issues warning instead of failing, i.e. I change: CONFIG_CHECK=IPV6 to CONFIG_CHECK="~IPV6" it compiles succesfully. Reproducible: Always
Fixed in git. Thanks for the report.