> I wonder how the Gentoo maintainers are dealing. I spoke to the gentoo firefox package maintainer last night. He even has firefox building on aarch64 with mu

> I wonder how the Gentoo maintainers are dealing. I spoke to the gentoo firefox package maintainer last night. He even has firefox building on aarch64 with musl, so things are pretty good. For more common targets, there's also the option of using the official binaries from Mozilla. Gentoo policy is to attempt to provide a way to use system libraries where possible except when those libraries are too heavily modified. If something breaks, they use the bundled package. You can see that's currently happening with harfbuzz in firefox until they bringup the patch: https://github.com/gentoo/gentoo/blob/master/www-client/firefox/firefox-72.0.1.ebuild https://github.com/gentoo/gentoo/blob/master/www-client/fire... From experience, it's usually fine to use system libs when available unless those system libs are unstable or development releases. Then all bets are off.