anchor.diff:  { stdenv, fetchFromGitHub, cmake, glew, freeimage,  liblockfile
   , openal, libtheora, SDL2, lzo, libjpeg, libogg, tbb
  -, pcre, makeWrapper }:
  +, pcre, makeWrapper, fetchpatch }:
   
   let
     version = "784-october-preview";
  
positive.code:   hardeningDisable = [ "format" ];
    cmakeFlags = [ "-DCMAKE_INCLUDE_PATH=${cryptopp}/include/cryptopp" ];
  
    buildInputs = [
      glew freeimage liblockfile openal cryptopp libtheora SDL2 lzo
      libjpeg libogg tbb pcre
  
negative.code:   preConfigure = ''
      substituteInPlace src/xrCore/xrCore.cpp \
        --replace /usr/share $out/share
    '';
  
    postInstall = ''
  