Comment # 8 on bug 1112817 from Wolfgang Rosenauer

ok, removed obsolete rust-std from the Requires but now the Firefox build tells
me:
[  143s]  0:09.63 checking for rustc... /usr/bin/rustc
[  143s]  0:09.63 checking for cargo... /usr/bin/cargo
[  143s]  0:09.71 checking rustc version... 1.30.0
[  143s]  0:09.76 checking cargo version... 1.27.0
[  143s]  0:09.77 ERROR: Cargo package manager 1.27.0 is too old.
[  143s]  0:09.77 To compile Rust language sources please install at least
[  143s]  0:09.77 version 1.28.0 of 'cargo' and make sure it is first in your
path.

Was rust and cargo in the past switching version in the same pace. So rust 1.26
and cargo 0.27 or something?

In any case the Firefox configure check expects this:

    rustc_min_version = Version('1.28.0')
    cargo_min_version = rustc_min_version

So I expect we need cargo 1.28 at least as well.