Unsupported FreeBSD version in bootstrap cargo

Hi all,
FreeBSD cargo is distributed for an unsupported FreeBSD version (10.3).

FreeBSD 10.x is now unsupported, while cargo is being distributed for this version.

This is also reported here:
https://github.com/rust-lang/cargo/issues/6612

I am trying to build a new package based on the more recent FreeBSD 12.0 but I am a complete rookie, can someone address me on how to do it?

cargo package? Shall I specify --target? Please help.

Thank you.

I'm also interested in getting this working. Have you made any progress?