vtable example broken

[tionis]

I'm getting the following error during compile:

# github.com/mattn/go-sqlite3/_example/vtable
./vtable.go:22:78: undefined: sqlite3.VTab
./vtable.go:23:11: c.DeclareVTab undefined (type *sqlite3.SQLiteConn has no field or method DeclareVTab)
./vtable.go:36:79: undefined: sqlite3.VTab
./vtable.go:46:39: undefined: sqlite3.VTabCursor
./vtable.go:65:48: undefined: sqlite3.InfoConstraint
./vtable.go:65:77: undefined: sqlite3.InfoOrderBy
./vtable.go:65:100: undefined: sqlite3.IndexResult
./vtable.go:67:18: undefined: sqlite3.IndexResult
./main.go:14:16: conn.CreateModule undefined (type *sqlite3.SQLiteConn has no field or method CreateModule)