After using "crossdev -C <target>" to remove failed builds, targets are removed, however, they remain listed in /var/lib/portage/world, and when attempting to update @world, we get: !!! Ebuilds for the following packages are either all !!! masked or don't exist: cross-aarch64-unknown-linux-gnueabi/glibc cross-aarch64-unknown-linux-gnueabi/linux-headers cross-aarch64-unknown-linux-androideabi/binutils cross-aarch64-unknown-linux-android/linux-headers cross-aarch64-linux-android/linux-headers cross-aarch64-unknown-linux-gnueabi/gcc cross-aarch64-unknown-linux-gnueabi/binutils cross-aarch64-unknown-linux-android/binutils cross-aarch64-unknown-linux-androideabi/linux-headers cross-aarch64-linux-android/binutils
*** This bug has been marked as a duplicate of bug 676490 ***