bug: Font onChange results in Valgrind Broken error on Darwin

[347Online]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

I am unable to build my configuration on darwin, getting an error pointing to valgrind being broken. If I try running with export NIXPKGS_ALLOW_BROKEN=1 and --impure, I get a failed assertion that stdenv.isLinux.

Needless to say I'm very confused 😅

Here is a full trace With Impure and Without

If there is any other information I can share that would be helpful, please let me know, thanks

Maintainer CC

@midchildan maybe?

System information

- system: `"aarch64-darwin"`
 - host os: `Darwin 24.1.0, macOS 15.1.1`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.24.11`
 - channels(root): `"nixpkgs"`
 - nixpkgs: `/nix/store/8fwsiv0hd7nw1brkvka0jf1frk3m7qkr-source`