While building nix on Darwin, I encountered an error in the `installCheckPhase`:
```
nix> building '/private/tmp/nix-build-nix-2.17.1.drv-1/nix-test/tests/fetchurl/store/mkc9z3arar02wi5jii655cjhdinx4npy-fetchurl.sh.drv'...
nix> waiting for children
nix> building of '/private/tmp/nix-build-nix-2.17.1.drv-1/nix-test/tests/fetchurl/store/mkc9z3arar02wi5jii655cjhdinx4npy-fetchurl.sh.drv^out' from .drv file: read 377 bytes
nix> objc[70707]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
nix> objc[70707]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
nix> waiting for children
```
I noticed that #278802 should have addressed this problem, but it didn't.
The solution for me was to replace `yes` with `YES`.
As it turns out, most of the references to `OBJC_DISABLE_INITIALIZE_FORK_SAFETY` use `YES` instead of `yes`.
https://airflow.apache.org/blog/airflow-1.10.10/#running-airflow-on-macoshttp://sealiesoftware.com/blog/archive/2017/6/5/Objective-C_and_fork_in_macOS_1013.html
The objective C code that parses the environment variable is defined in
the function `environ_init` in [here](cd5e62a559/runtime/objc-runtime.mm (L265)) and it does
`*opt->var = (0 == strcmp(value, "YES"));`.
```
% nix-info -m
- system: `"aarch64-darwin"`
- host os: `Darwin 21.3.0, macOS 12.2.1`
- multi-user?: `yes`
- sandbox: `yes`
- version: `nix-env (Nix) 2.19.2`
- channels(hetzner): `"darwin, nixpkgs-22.05-darwin"`
- channels(root): `"darwin, nixpkgs-23.05-darwin"`
- nixpkgs: `/Users/hetzner/git/nixpkgs`
```
Following from #280522, the xattr dependency still failed the
pythonRuntimeDepsCheck hook, likely overlooked because it is a
Darwin-only dep:
> Checking runtime dependencies for poetry-1.7.1-py3-none-any.whl
> - xattr<0.11.0,>=0.10.0 not satisfied by version 1.0.0
From 0.10.0 to 1.0.0 there are no functional changes with compatibility
implications, only dropped support for Python 2.
> Checking runtime dependencies for poetry-1.7.1-py3-none-any.whl
> - fastjsonschema not installed
> - platformdirs<4.0.0,>=3.0.0 not satisfied by version 4.0.0
Conflicts:
pkgs/development/python-modules/dbt-core/default.nix
pkgs/development/python-modules/dbt-semantic-interfaces/default.nix
Still broken by pydantic 2 bump, though.
