This is needed to make glibc-2.20 work correctly.
This is required to build with glibc-2.20.
This one came from an unaccepted bugzilla post https://bugs.gentoo.org/show_bug.cgi?id=530170
This got dropped by upstream anyway.
This deduplicates files on btrfs filesystems, which I'm hoping to use to reduce the amount of duplicate files on Lulu's laptop, so I can install a SSD.
My ABIs aren't stable, so this lets me rebuild everything when I change versions.