if ! has nix_direnv_version || ! nix_direnv_version 1.4.0; then source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/1.4.0/direnvrc" "sha256-4XfVDjv75eHMWN4G725VW7BoOV4Vl3vAabK4YXIfPyE=" fi use flake