configure.ac contains: for lib in db-4.7 db-4.6 db-4.5 db-4.4 db-4.3 db-4.2 db-4.1 db-4.0 db-4 db4 db-3.2 db-3 db3 db; do but the dep matches db:4.8
I had to fix a couple of other things for Prefix for this ebuild, and fixed this issue on the spot in 0.57-r1