This was originally tracked in bug #498466. However, s390 was somehow lost (or never added?) in the original bug report. Opening a new bug report instead of revising an old one: mail-mta/postfix dropped s390 KEYWORD because of dev-db/lmdb dependency (via the lmdb USE flag) Please {re}keyword dev-db/lmdb and mail-mta/postfix Thank you
~s390 keyworded