title: requirement.txt installation is failing while building "orjson" on 64 bit python interpreter on 64 bit Mac OSX
body: <p>Running requirements.txt installation for a project(Fast API). Ending up with below error. I have try approach from <a href="https://github.com/rust-lang/rust/issues/61925" rel="nofollow noreferrer">https://github.com/rust-lang/rust/issues/61925</a>
  and I have set up rust to &quot;nightly&quot; using <code>rustup override set nightly</code> still facing the error.</p>
  <pre><code>  Using cached orjson-3.4.3.tar.gz (1.2 MB)
    Installing build dependencies ... done
    Getting requirements to build wheel ... done
      Preparing wheel metadata ... error
      ERROR: Command errored out with exit status 1:
       command: /usr/local/opt/python@3.8/bin/python3.8 /usr/local/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/c7/0n1qpwb16l55dfdwqs4xt97dhw2m6y/T/tmpwyr1rz66
           cwd: /private/var/folders/c7/0n1qpwb16l55dfdwqs4xt97dhw2m6y/T/pip-install-qmnttz7p/orjson
      Complete output (13 lines):
       maturin failed
        Caused by: Cargo metadata failed. Do you have cargo in your PATH?
        Caused by: Error during execution of `cargo metadata`: error: failed to run `rustc` to learn about target-specific information
      
      Caused by:
        process didn't exit successfully: `rustc - --crate-name ___ --print=file-names -Z mutable-noalias --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit code: 1)
        --- stderr
        error: the option `Z` is only accepted on the nightly compiler
      
      
      Checking for Rust toolchain....
      Running `maturin pep517 write-dist-info --metadata-directory /private/var/folders/c7/0n1qpwb16l55dfdwqs4xt97dhw2m6y/T/pip-modern-metadata-c1upg8fc --interpreter /usr/local/Cellar/python@3.8/3.8.6_2/bin/python3.8 --manylinux=off --strip=on`
      Error: Command '['maturin', 'pep517', 'write-dist-info', '--metadata-directory', '/private/var/folders/c7/0n1qpwb16l55dfdwqs4xt97dhw2m6y/T/pip-modern-metadata-c1upg8fc', '--interpreter', '/usr/local/Cellar/python@3.8/3.8.6_2/bin/python3.8', '--manylinux=off', '--strip=on']' returned non-zero exit status 1.
      ----------------------------------------
  ERROR: Command errored out with exit status 1: /usr/local/opt/python@3.8/bin/python3.8 /usr/local/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/c7/0n1qpwb16l55dfdwqs4xt97dhw2m6y/T/tmpwyr1rz66 Check the logs for full command output.
  </code></pre>
  <p>Please advise!
  Thank you!</p>