Created attachment 580068 [details] build log www-client/firefox-60.7.0 requires sys-devel/clang:8 build will fail without much warning or error.
not sure where you got llvm 0:06.49 ERROR: Cargo package manager not found. 0:06.49 To compile Rust language sources, you must have 'cargo' in your path. it's likely duplicate of 671182 run 'eselect rust set <installed rust version>' and retry *** This bug has been marked as a duplicate of bug 671182 ***
That indeed fixed it, but thats hardly a resolution for the average user. The only reason I would ever install 'rust' is as a ff dependency. and I only have one version of rust: eselect rust list Available Rust versions: [1] rust-1.34.2 * I would think firefox www-client/firefox-60.7.0.ebuild should rdepend on on the version of rust it needs like so: RDEPEND=" system-icu? ( >=dev-libs/icu-60.2 ) jack? ( virtual/jack ) >=dev-libs/nss-3.36.7 >=dev-libs/nspr-4.19 selinux? ( sec-policy/selinux-mozilla ) >=virtual/rust-1.34.2"