A few ebuilds use bash '[[ ${foo} < ${bar} ]]' comparison to compare numbers and package versions.
In bash '<' is for lexicographical string comparison (see man bash 'CONDITIONAL EXPRESSIONS' section). It's almost never what you want: $ [[ 1.2.3 < 1.2.3 ]] && echo yes || echo no no # ok $ [[ 1.2.9 < 1.2.3 ]] && echo yes || echo no no # ok $ [[ 1.2.9 < 1.2.10 ]] && echo yes || echo no no # whoops A very crude grep shows many affected packages: $ git grep -E '\[\[.*[<>]\s*[0-9]+.*\]\]' | cat app-misc/unfoo/unfoo-1.0.8.ebuild: elif [[ ${REPLACING_VERSIONS} < 1.0.7 ]]; then dev-db/libzdb/libzdb-3.1-r1.ebuild: if [[ $(gcc-version) < 4.1 ]];then dev-db/libzdb/libzdb-3.1.ebuild: if [[ $(gcc-version) < 4.1 ]];then eclass/kernel-2.eclass: if [[ ${K_SYMLINK} > 0 ]]; then eclass/kernel-2.eclass: if [[ ${KV_MAJOR} -ge 3 || ${KV_MAJOR}.${KV_MINOR}.${KV_PATCH} > 2.6.24 ]] ; then eclass/kernel-2.eclass: if [[ ${KV_MAJOR} -ge 3 || ${KV_MAJOR}.${KV_MINOR}.${KV_PATCH} > 2.6.28 ]]; then eclass/kernel-2.eclass: if [[ -n ${KV_MINOR} && ${KV_MAJOR}.${KV_MINOR}.${KV_PATCH} < 2.6.27 ]] ; then ... <list goes on and on> ... Some of them are benign like '[[ ${foo} > 0 ]]': I think it's still worth fixing them. Some of them are worse like [[ $(gcc-version) < 4.1 ]]: gcc-version=10 will break here. I've created a tracker and dumped a few suspects there: https://bugs.gentoo.org/705240 I'm sure there are more creative ways to hide version (or just number) compare behind lexicographical string comparison. If you have an idea how grep those out please do report and fix them :) Thank you! -- Sergei