See the tracker bug. # note, $REPLACING_VERSIONS will always contain 0 or 1 PV's for slim note: you have no reason to make assumptions like this. if ! version_is_at_least "1.3.2-r7" "${REPLACING_VERSIONS:-1.0}" ; then This is going to fail hard when RV has >1 value.
commit 0413ea769ca646facbcf7b8c797778a0fff98aa9 Author: Ian Stakenvicius <axs@gentoo.org> Date: Mon Jul 25 10:36:41 2016 -0400 x11-misc/slim: process ${REPLACING_VERSIONS} as a list Bug: http://bugs.gentoo.org/589540