How to reproduce: man 5 ebuild /execinto It says about execinto at the doexe description. The correct would be exeinto. Tested with sys-apps/portage-2.1.8.3 (the latest stable version)
Thanks, this is fixed in git now: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=4628db03bdb74f37c0804e5cad72a8fd590c0d24
This is in 2.2_rc68, but I'll leave this bug open until it's in an unmasked version.
This is fixed in 2.1.9.