I've definitely used C23 via Nixpkgs long ago at this point, did you use the `gcc` package and `-std=c23`? Both unstable and 25.11 should support it on all curr

I've definitely used C23 via Nixpkgs long ago at this point, did you use the `gcc` package and `-std=c23`? Both unstable and 25.11 should support it on all currently packaged GCC versions.