anchor.diff:  
     lxc = callPackage ../os-specific/linux/lxc { };
   
  -  lzip = callPackage ../tools/compression/lzip { texinfo = texinfo5; };
  +  lzip = callPackage ../tools/compression/lzip { };
   
     lzma = xz;
   
  
positive.code:     librsvg = null;
      alsaLib = null;
      imagemagick = null;
      texinfo = texinfo5;
  
      # use clangStdenv on darwin to deal with: unexec: 'my_edata is not in
      # section __data'
  
negative.code: 
    bashInteractive = appendToName "interactive" (callPackage ../shells/bash {
      interactive = true;
    });
  
    bashCompletion = callPackage ../shells/bash-completion { };
  