When installed, cannot locate dbschema.sql

(observed with rev 38 of lp:u1db-qt)

Steps to reproduce:
 1) Build locally and install system-wide:
    cmake -DCMAKE_INSTALL_PREFIX=/usr .
    make
    sudo make install

 2) Open the following example in qmlscene:

    import U1db 1.0 as U1db

    U1db.Database {
        path: "test"
    }

Expected result: no error
Current result: u1db: "Failed to read internal schema: FileError 5"