Change Details

`contrib/guix/guix-build` This will be tested more thoroughly when we support Mac OS builds.

With the Apple SDK in the expected directory: `HOSTS=x86_64-apple-darwin contrib/guix/guix-build` Check that it does not fail early because of not finding the SDK.

`contrib/guix/guix-build`With the Apple SDK in the expected directory: This will be tested more thoroughly when we support Mac OS builds`HOSTS=x86_64-apple-darwin contrib/guix/guix-build` Check that it does not fail early because of not finding the SDK.