anchor.diff:      ++ stdenv.lib.optional (qt != null) qt;
   
     prefixKey = "--prefix ";
  -  
  +
     configureFlags =
       [ "--dot dot" ]
       ++ stdenv.lib.optional (qt != null) "--with-doxywizard";
  
positive.code:     '';
  
      maintainers = [stdenv.lib.maintainers.simons];
      platforms = stdenv.lib.platforms.unix;
    };
  }
  
negative.code:   makeFlags = "MAN1DIR=share/man/man1";
  
    enableParallelBuilding = true;
  
    meta = {
      license = "GPLv2+";
      homepage = "http://doxygen.org/";
  