Created attachment 472682 [details] emerge info "$ mu find something" "mu: db version: 9.9, but we need 9.9; database rebuild is required" Rebuilding the database doesn't help. ~amd64-keyworded 0.9.18-r1 works properly.
I had this problem also -- I can confirm that upgrading to 0.9.18-r1 fixes the problem. Please unmask!
(sorry, my mistake)
Sorry, I forgot all about this bug after I adopted this package. This bug only affects a very old version no longer in the tree.