anchor.diff:      inherit fetchurl stdenv perl m4 lzma;
     };
   
  +  autoconf213 = import ../development/tools/misc/autoconf/2.13.nix {
  +    inherit fetchurl stdenv perl m4 lzma;
  +  };
  +
     automake = automake19x;
   
     automake17x = import ../development/tools/misc/automake/automake-1.7.x.nix {
  
positive.code: 
    scummvm = import ../games/scummvm {
      inherit fetchurl stdenv SDL zlib mpeg2dec;
    };
  
    # You still can override by passing more arguments.
  
negative.code:   };
  
    pth = import ../development/libraries/pth {
      inherit fetchurl stdenv;
    };
  
    pthread_stubs = import ../development/libraries/pthread-stubs {
      inherit fetchurl stdenv;
    };
  
  