anchor.diff:  fetchzip {
     name = "vista-fonts-1";
   
  -  url = http://download.microsoft.com/download/f/5/a/f5a3df76-d856-4a61-a6bd-722f52a5be26/PowerPointViewer.exe;
  +  url = https://web.archive.org/web/20171225132744/http://download.microsoft.com/download/E/6/7/E675FFFC-2A6D-4AB0-B3EB-27C9F8C8F696/PowerPointViewer.exe;
   
     postFetch = ''
       ${cabextract}/bin/cabextract --lowercase --filter ppviewer.cab $downloadedFile
  
positive.code:     # Set a non-zero priority to allow easy overriding of the
      # fontconfig configuration files.
      priority = 5;
      broken = true; # source url is 404
    };
  }
  
negative.code:     done
    '';
  
    sha256 = "1l27zg5jraa16zm11d3qz1w7m6f1ih3xy5avww454ylm50fw6z11";
  
    meta = {
      description = "Some TrueType fonts from Microsoft Windows Vista (Calibri, Cambria, Candara, Consolas, Constantia, Corbel)";
  