Gentoo Packages

app-arch/libarchive: Enable Blake2 hash support via <pkg>app-crypt/libb2</pkg>.
app-crypt/xsum: Enable BLAKE2 hashes using app-crypt/libb2

Warning: USE flag 'blake2' is used in ebuilds/metadata but is not defined in profiles/use.desc
Warning: USE flag 'blake2' used by dev-python/pymultihash but has no description in metadata.xml, use.local.desc or use.desc

Package	Local Description (use.local.desc)	Metadata Description (metadata.xml)
app-arch/libarchive	Enable Blake2 hash support via app-crypt/libb2.	Enable Blake2 hash support via <pkg>app-crypt/libb2</pkg>.
app-crypt/xsum	-	Enable BLAKE2 hashes using app-crypt/libb2
dev-python/pymultihash	-	-

USE Flag: blake2