error: … while calling the 'derivationStrict' builtin at «nix-internal»/derivation-internal.nix:37:12: 36| 37| strict = derivationStrict drvAttrs; | ^ 38| … while evaluating derivation 'devshell' whose name attribute is located at «github:numtide/devshell/255a2b1725a20d060f566e4755dbf571bbbb5f76?narHash=sha256-460jc0%2BCZfyaO8%2Bw8JNtlClB2n4ui1RbHfPTLkpwhU8%3D»/nix/mkNakedShell.nix:44:11 … while evaluating attribute 'args' of derivation 'devshell' at «github:numtide/devshell/255a2b1725a20d060f566e4755dbf571bbbb5f76?narHash=sha256-460jc0%2BCZfyaO8%2Bw8JNtlClB2n4ui1RbHfPTLkpwhU8%3D»/nix/mkNakedShell.nix:52:3: 51| # Bring in the dependencies on `nix-build` 52| args = [ | ^ 53| "-ec" (stack trace truncated; use '--show-trace' to show the full, detailed trace) error: Refusing to evaluate package 'roon-server-2.67.1661' in /nix/store/wz6pw7bm0qmj0j6n8i2craddlhj662l5-source/pkgs/by-name/ro/roon-server/package.nix:109 because it is not available on the requested hostPlatform: hostPlatform.system = "aarch64-linux" package.meta.platforms = [ "x86_64-linux" ] package.meta.badPlatforms = [ ] a) To temporarily allow packages that are unsupported for this system, you can use an environment variable for a single invocation of the nix tools. $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake, then pass `--impure` in order to allow use of environment variables. b) For `nixos-rebuild` you can set { nixpkgs.config.allowUnsupportedSystem = true; } in configuration.nix to override this. c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add { allowUnsupportedSystem = true; } to ~/.config/nixpkgs/config.nix.