anchor.diff:          ln -s "${libvirtNetwork}" "$out/net-test.xml"
         '';
   
  -      phases = [ "buildPhase" "installPhase" "fixupPhase" ];
  +      phases = [ "buildPhase" ];
   
         buildPhase = ''
           function cleanup() {
  
positive.code:           "${virshCmds}" >/dev/null || exit 1
  
          sleep 3 # try to let ztail finish
          cleanup
        '';
  
        installPhase = ''
          mkdir $out
          cp -r build/* $out/
        '';
      };
  
    };
  
negative.code:             echo >&2 "Test script failed with exit code $ex"
              exit 1
            fi
          '';
        };
  
        extraBuildSteps = mkOption {
          type = types.lines;
          default = "";
          description = ''
            Extra build steps that is run as the last part of the build phase
            for the <code>output</code> build.
          '';
        };
  
  