The following line in pkg_postinst() in all ebuilds >=2.0.51_pre17 fails on systems whose find utility doesn't support a -gid option (BSD for example). find "${ROOT}/var/lib/portage" ! -gid $(id -g portage) -o -perm -002 -print0 | ${XARGS} -0n 500 rm -Rvf Instead, the -group option may be used (it works for both names and numerical ID's ).
51_rc1