--enable-rust with pre-downloaded Rust dependencies fails: no .cargo-checksum.json files
In the FreeBSD port I am downloading the dependencies and supplying digest-0.7.2 libc-0.2.39 directories as they appear on GitHub pointed by the TOR_RUST_DEPENDENCIES environment variable.
The build fails:
error: failed to load source for a dependency on `digest` Caused by: Unable to update registry `https://github.com/rust-lang/crates.io-index` Caused by: failed to update replaced source registry `https://github.com/rust-lang/crates.io-index` Caused by: failed to load checksum `.cargo-checksum.json` of libc v0.2.39 Caused by: failed to read `/usr/ports/security/tor/work/tor-0.4.0.5/rs/libc-0.2.39/.cargo-checksum.json`
Is some command supposed to be run that would build .cargo-checksum.json ?