anchor.diff:    };
   
     nativeBuildInputs = [ cmake pkg-config ];
  -  buildInputs = [ pcre python2 zlib libxml2 lz4 xz gsl_1 xxHash libxcrypt ]
  +  buildInputs = [ pcre python2 zlib libxml2 lz4 xz gsl xxHash libxcrypt ]
       ++ lib.optionals (!stdenv.isDarwin) [ libX11 libXpm libXft libXext libGLU libGL ]
       ++ lib.optionals (stdenv.isDarwin) [ Cocoa OpenGL ]
     ;
  
positive.code:     homepage = "https://root.cern.ch/";
      description = "A data analysis framework";
      platforms = platforms.unix;
      maintainers = with maintainers; [ veprbl ];
      license = licenses.lgpl21;
    };
  
negative.code: , libxcrypt
  , lz4
  , xz
  , gsl
  , xxHash
  , Cocoa
  , OpenGL
  