anchor.diff:                    extraCommands;
           };
         result = runCommand "docker-image-${baseName}.tar.gz" {
  -        buildInputs = [ jshon pigz coreutils findutils jq ];
  +        nativeBuildInputs = [ jshon pigz coreutils findutils jq ];
           # Image name and tag must be lowercase
           imageName = lib.toLower name;
           imageTag = if tag == null then "" else lib.toLower tag;
  
positive.code:             os = "linux";
            });
            impure = runCommand "${baseName}-standard-dynamic-date.json"
              { buildInputs = [ jq ]; }
              ''
                 jq ".created = \"$(TZ=utc date --iso-8601="seconds")\"" ${pure} > $out
              '';
  
negative.code:     uid ? 0, gid ? 0,
    }:
      runCommand "${name}-customisation-layer" {
        nativeBuildInputs = [ jshon rsync tarsum ];
        inherit extraCommands;
      }
      ''
  