error: … while calling the 'derivationStrict' builtin at «nix-internal»/derivation-internal.nix:37:12: 36| 37| strict = derivationStrict drvAttrs; | ^ 38| … while evaluating derivation 'rhwp-wasm-0.7.17' whose name attribute is located at «github:NixOS/nixpkgs/9ae611a455b90cf061d8f332b977e387bda8e1ca?narHash=sha256-md8WlXOlfnIeHeOScMTTHFyf2d6iaTwPl2apR5EQ3P4%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11 … while evaluating attribute 'cargoDeps' of derivation 'rhwp-wasm-0.7.17' at «github:NixOS/nixpkgs/9ae611a455b90cf061d8f332b977e387bda8e1ca?narHash=sha256-md8WlXOlfnIeHeOScMTTHFyf2d6iaTwPl2apR5EQ3P4%3D»/pkgs/build-support/rust/build-rust-package/default.nix:104:7: 103| 104| cargoDeps = | ^ 105| if cargoVendorDir != null then (stack trace truncated; use '--show-trace' to show the full, detailed trace) error: No hash was found while vendoring the git dependency svg2pdf-0.13.0. You can add a hash through the `outputHashes` argument of `importCargoLock`: outputHashes = { "svg2pdf-0.13.0" = ""; }; If you use `buildRustPackage`, you can add this attribute to the `cargoLock` attribute set.