>> Unpacking linux-4.9.tar.xz to /var/tmp/portage/sys-kernel/gentoo-sources-4.9.8/work* Excluding Patch #5000_enable-additional-cpu-optimizations-for-gcc.patch ... [ ok ]
* Failed to dry-run patch genpatches-4.9-10.base.tar.patch
* Please attach /var/tmp/portage/sys-kernel/gentoo-sources-4.9.8/temp/genpatches-4.9-10.base.tar.err to any bug you may post.
* ERROR: sys-kernel/gentoo-sources-4.9.8::gentoo failed (unpack phase):
* Unable to dry-run patch on any patch depth lower than 5.