lang/rust does not build on aarch64

Hi,
it seems rust does not build on aarch64:
===>  Building for rust-1.52.1
rustup not detected: [Errno 2] No such file or directory: 'rustc'
falling back to auto-detect
running: /wrkdirs/usr/ports/lang/rust/work/bootstrap/bin/cargo build
--manifest-path
/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/Cargo.toml
--verbose --frozen
Traceback (most recent call last):
  File "x.py", line 27, in <module>
    bootstrap.main()
  File
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/bootstrap.py",
line 1175, in main
    bootstrap(help_triggered)
  File
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/bootstrap.py",
line 1148, in bootstrap
    build.build_bootstrap()
  File
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/bootstrap.py",
line 900, in build_bootstrap
    run(args, env=env, verbose=self.verbose)
  File
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/bootstrap.py",
line 153, in run
    raise RuntimeError(err)
RuntimeError: failed to run:
/wrkdirs/usr/ports/lang/rust/work/bootstrap/bin/cargo build --manifest-path
/wrkdirs/usr/ports/lang/rust/work/rustc-1.52.1-src/src/bootstrap/Cargo.toml
--verbose --frozen
*** Error code 1

Stop.
make: stopped in /usr/ports/lang/rust

Is this known?

Thank you.

BR,