Talk: Nixpkgs/Building RPM DEB with nixpkgs

nix-build ./deb.nix

error: undefined variable 'lib'

      at nixpkgs/pkgs/build-support/release/debian-build.nix:60:23:

          59|         --fstrans=${if fsTranslation then "yes" else "no"} \
          60|         --requires="${lib.concatStringsSep "," debRequires}" \
            |                       ^
          61|         --provides="${lib.concatStringsSep "," debProvides}" \