anchor.diff:  mapTestOn (rec {
   
     gitAndTools.gitAnnex = linux;
  +
  +  jhc = linux;
   
     haskellPackages_ghc742 = {
       abstractPar = linux;
  
positive.code:     zlib = linux;
    };
  
  })
  
negative.code:     html = linux;
      HTTP = linux;
      HUnit = linux;
      jailbreakCabal = linux;
      monadPar = linux;
      mtl = linux;
      network = linux;
  