anchor.diff:          echo "file deb-extra $(ls $i/debs/*.deb | sort | head -1)" >> $out/nix-support/hydra-build-products
         done
   
  -      eval "$postDebInstall"
  +      eval "$postInstall"
       ''; # */
   
       meta = (if args ? meta then args.meta else {}) // {
         description = "Deb package for ${diskImage.fullName}";
       };
  -  } // removeAttrs args ["name" "meta" "vmTools"]
  +  }
   
   ))
  
positive.code: vmTools.runInLinuxImage (stdenv.mkDerivation (
  
    {
      name = name + "-" + diskImage.name + (if src ? version then "-" + src.version else "");
  
      doCheck = true;
  
      prefix = "/usr";
  
      prePhases = [ "installExtraDebsPhase" "sysInfoPhase" ];
      postPhases = [ "debInstallPhase" ];
  
      # !!! cut&paste from rpm-build.nix
      postHook = ''
  
negative.code:       mkdir -p $out/debs
        find . -name "*.deb" -exec cp {} $out/debs \;
  
        [ "$(echo $out/debs/*.deb)" != "" ]
  
        for i in $out/debs/*.deb; do
  