anchor.diff:    ];
   
     buildInputs = [
  -    boost172
  +    boost17x
       cimg
       eigen
       lcov
  
positive.code:   '';
  
    # Enable output images from the placer.
    cmakeFlags = [ "-DUSE_CIMG_LIB=ON" ];
  
    # Resynthesis needs access to the Yosys binaries.
    qtWrapperArgs = [ "--prefix PATH : ${lib.makeBinPath [ yosys ]}" ];
  
negative.code: 
  mkDerivation rec {
    pname = "openroad";
    version = "unstable-2022-07-19";
  
    src = fetchFromGitHub {
      owner = "The-OpenROAD-Project";
      repo = "OpenROAD";
      rev = "2610b3953ef62651825d89fb96917cf5d20af0f1";
      fetchSubmodules = true;
      sha256 = "sha256-BP0JSnxl1XyqHzDY4eITaGHevqd+rbjWZy/LAfDfELs=";
    };
  
    nativeBuildInputs = [
  