Build with default options (no gvariant) broken

Getting this error with latest git revision:

error[E0432]: unresolved import `crate::Maybe`
 --> /home/greg/.local/share/cargo/git/checkouts/zbus-e0109d69954ffaa9/c499a7f/zvariant/src/owned_value.rs:5:22
  |
5 |     Array, Dict, Fd, Maybe, ObjectPath, OwnedObjectPath, OwnedSignature, Signature, Str, Structure,
  |                      ^^^^^ no `Maybe` in the root