@dusnm @musl What kind of extensions? Most of the common stuff is in musl, similarly to what one would expect on say a BSD.

And then most musl distros also have packages like {argp,fts,obstack,queue,rpmatch}-standalone and libucontext.

Like the vast majority of packages masked for musl in gentoo are binaries and stuff which probably needs some patching: https://gitweb.gentoo.org/repo/gentoo.git/tree/profiles/features/musl/package.mask