Issue building cryptography in NixOS

Derivations in requirements file

"cryptography" = python.mkDerivation {
      name = "cryptography-2.9.2";
      src = pkgs.fetchurl {
        url = "https://files.pythonhosted.org/packages/56/3b/78c6816918fdf2405d62c98e48589112669f36711e50158a0c15d804c30d/cryptography-2.9.2.tar.gz";
        sha256 = "a0c30272fb4ddda5f5ffc1089d7405b7a71b0b0f51993cb4e5dbb4590b2fc229";
};
      doCheck = commonDoCheck;
      format = "pyproject";
      buildInputs = commonBuildInputs ++ [
        self."cffi"
        self."setuptools"
        self."wheel"
      ];
      propagatedBuildInputs = [
        self."cffi"
        self."six"
      ];
      meta = with pkgs.stdenv.lib; {
        homepage = "https://github.com/pyca/cryptography";
        license = licenses.asl20;
        description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers.";
      };
    };
    
    "setuptools" = python.mkDerivation {
      name = "setuptools-46.4.0";
      src = pkgs.fetchurl {
        url = "https://files.pythonhosted.org/packages/ac/d6/0f6c0d9d0b07bbb2085e94a71aded1e137c7c9002ac54924bc1c0adf748a/setuptools-46.4.0.zip";
        sha256 = "4334fc63121aafb1cc98fd5ae5dd47ea8ad4a38ad638b47af03a686deb14ef5b";
};
      doCheck = commonDoCheck;
      format = "setuptools";
      buildInputs = commonBuildInputs ++ [ ];
      propagatedBuildInputs = [ ];
      meta = with pkgs.stdenv.lib; {
        homepage = "https://github.com/pypa/setuptools";
        license = licenses.mit;
        description = "Easily download, build, install, upgrade, and uninstall Python packages";
      };
    };
    
    "wheel" = python.mkDerivation {
      name = "wheel-0.34.2";
      src = pkgs.fetchurl {
        url = "https://files.pythonhosted.org/packages/75/28/521c6dc7fef23a68368efefdcd682f5b3d1d58c2b90b06dc1d0b805b51ae/wheel-0.34.2.tar.gz";
        sha256 = "8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96";
};
      doCheck = commonDoCheck;
      format = "setuptools";
      buildInputs = commonBuildInputs ++ [
        self."setuptools"
      ];
      propagatedBuildInputs = [ ];
      meta = with pkgs.stdenv.lib; {
        homepage = "https://github.com/pypa/wheel";
        license = licenses.mit;
        description = "A built-package format for Python";
      };
    };