sys-libs/db-4.8.24 was released. Support for C# was added. Maybe a new USE flag should be added. http://www.oracle.com/technology/documentation/berkeley-db/db/programmer_reference/changelog_4_8.html
Fixed. (Commit approved by Caleb Tennis) I haven't seen a `configure` option for C#, so I haven't added a new USE flag. It should be investigated and added in the future. Unfortunately sys-libs/db-4.8.24 seems to fail to build with USE="java", but another bug should be opened for this problem.