anchor.diff:      ";
     };
     # example usage
  -  testSourceWithTags = sourceWithTagsDerivation (ghc68_extra_libs ghcsAndLibs.ghc68).happs_server_darcs.passthru.sourceWithTags;
  +  #testSourceWithTags = sourceWithTagsDerivation (ghc68_extra_libs ghcsAndLibs.ghc68).happs_server_darcs.passthru.sourceWithTags;
   
     addCTaggingInfo = deriv :
       deriv // { 
  
positive.code:         # some additional libs
        inherit ghc;
    };
  
    # ghc66boot = import ../development/compilers/ghc-6.6-boot {
    #  inherit fetchurl stdenv perl readline;
  
negative.code:     }.derivations;
  
  
     /* commented to not make the buildfarm fail. You need to install nixRepositoryManager and run it..
  
    # the wrappers basically does one thing: It defines GHC_PACKAGE_PATH before calling ghc{i,-pkg}
    # So you can have different wrappers with different library combinations
    # So installing ghc libraries isn't done by nix-env -i package but by adding
  