anchor.diff:            "${virshCmds}" >/dev/null || exit 1
   
           sleep 3 # try to let ztail finish
  +
  +        mkdir $out
  +        cp -r build/* $out/
  +
  +        ${cfg.extraBuildSteps}
  +
           cleanup
         '';
  -
  -      installPhase = ''
  -        mkdir $out
  -        cp -r build/* $out/
  -      '';
       };
   
     };
  
positive.code:             echo >&2 "Test script failed with exit code $ex"
              exit 1
            fi
          '';
        };
  
  
negative.code:         ln -s "${libvirtNetwork}" "$out/net-test.xml"
        '';
  
        phases = [ "buildPhase" ];
  
        buildPhase = ''
          function cleanup() {
  