Error in Windows Cross Build

[wagesj45]

There seems to be a problem with building Windows executable in Linux. It is possibly related to this note in the Firefox code, which in turn references this issue. I can't tell if this is a Mercury thing with a misconfigured mozbuild configuration or an upstream problem in either Firefox or Rust.

Log

Using the --cross-avx2 configuration.

...
 0:04.95    Compiling nss-gk-api v0.3.0
 0:04.95    Compiling gpu-descriptor-types v0.1.1
 0:04.95 error[E0433]: failed to resolve: could not find `windows_rs_path` in `mozbuild`
 0:04.95   --> build/rust/windows/src/lib.rs:24:20
 0:04.95    |
 0:04.95 24 | include!(mozbuild::windows_rs_path!("src/Windows/mod.rs"));
 0:04.95    |                    ^^^^^^^^^^^^^^^ could not find `windows_rs_path` in `mozbuild`
 0:04.95 For more information about this error, try `rustc --explain E0433`.
 0:04.96 error: could not compile `windows` (lib) due to 1 previous error
 0:04.96 warning: build failed, waiting for other jobs to finish...
 0:10.07 gmake[4]: *** [/home/[user]/mozilla-unified/config/makefiles/rust.mk:490: force-cargo-library-build] Error 101
 0:10.07 gmake[3]: *** [/home/[user]/mozilla-unified/config/recurse.mk:72: toolkit/library/rust/target-objects] Error 2
 0:10.07 gmake[2]: *** [/home/[user]/mozilla-unified/config/recurse.mk:34: compile] Error 2
 0:10.07 gmake[1]: *** [/home/[user]/mozilla-unified/config/rules.mk:361: default] Error 2
 0:10.07 gmake: *** [client.mk:60: build] Error 2
 0:10.09 W 307 compiler warnings present.