libcxxrt-unstable 2022-08-08 -> 20180311 https://repology.org/metapackage/libcxxrt-unstable/versions
attrpath: libcxxrt-unstable
Received ExitFailure 1 when running
Raw command: /nix/store/3nqhcyc7vid1npgcd0m7arg5sn325nhz-nix-2.12.0/bin/nix eval .#libcxxrt-unstable --apply "p: builtins.hasAttr \"updateScript\" p"
Standard error:

error: flake 'git+file:///var/cache/nixpkgs-update/worker/worktree/libcxxrt-unstable' does not provide attribute 'packages.x86_64-linux.libcxxrt-unstable', 'legacyPackages.x86_64-linux.libcxxrt-unstable' or 'libcxxrt-unstable'