Display if a dependency can be optional
Display if a dependency can be optional

Ignore-this: b710f67b95d26345f2af62408d4fb8e4

darcs-hash:20101103105551-4d692-77084d27d56d09c625af27b1effe92e38f41e160

avsm/oasis-db-mirror,avsm/oasis-db-mirror,ocaml/oasis-db,avsm/oasis-db-mirror,ocaml/oasis-db,avsm/oasis-db-mirror,ocaml/oasis-db