anchor.diff:        already part of the store. Find the file on your Mathematica CD
         and add it to the nix store with nix-store --add-fixed sha256 <FILE>.
       '';
  -    sha256 = "1qqwz8gbw74rnnyirpbdanwx3d25s4x0i4zc7bs6kp959x66cdkw";
  +    sha256 = "4a1293cc1c404303aa1cab1bd273c7be151d37ac5ed928fbbb18e9c5ab2d8df9";
     };
   
     buildInputs = [
  
positive.code:     for path in mathematica MathKernel Mathematica WolframKernel wolfram math; do
        sed -i -e 's#export LD_LIBRARY_PATH$#export LD_LIBRARY_PATH=${zlib}/lib:\''${LD_LIBRARY_PATH}#' $path
      done
    '';
  
    preFixup = ''
  
negative.code:     patchelf
      alsaLib
      coreutils
      dbus
      fontconfig
      freetype
      gcc.cc
  