https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: media-libs/kvazaar-2.0.0 uses -Werror for build. Discovered on: amd64 (internal ref: tinderbox) -Werror is not recommended for releases and should always be disabled when encountered in build-logs, because there are numerous cases where this breaks without purpose. See also: https://devmanual.gentoo.org/ebuild-writing/common-mistakes/index.html NOTE: If you want to change the summary, to avoid auto-filed duplicates, please at least keep the word '-Werror'
As far as I can tell, there's no Werror in use.