Package ebuild should contain 'selinux' USE flag so that it can pull sec-policy/selinux-tripwire automatically on selinux-enabled hardened systems. Reproducible: Always
Thanks for the report. Fixed: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8b4f85b147548ca8f5398c3b0830d6e7bd1afe99