anchor.diff:      ++ lib.optional enableOpenMP llvmPackages.openmp
       ++ lib.optionals enablePython (with python3Packages; [ cython numpy python ]);
   
  +  # compile CUDA code for all extant GPUs so the binary will work with any GPU
  +  # and driver combination. to be ultimately solved upstream:
  +  # https://github.com/LLNL/zfp/issues/178
  +  # NB: not in cmakeFlags due to https://github.com/NixOS/nixpkgs/issues/114044
  +  preConfigure = lib.optionalString enableCuda ''
  +    cmakeFlagsArray+=(
  +      "-DCMAKE_CUDA_FLAGS=-gencode=arch=compute_52,code=sm_52 -gencode=arch=compute_60,code=sm_60 -gencode=arch=compute_61,code=sm_61 -gencode=arch=compute_70,code=sm_70 -gencode=arch=compute_75,code=sm_75 -gencode=arch=compute_80,code=sm_80 -gencode=arch=compute_86,code=sm_86 -gencode=arch=compute_87,code=sm_87 -gencode=arch=compute_86,code=compute_86"
  +    )
  +  '';
  +
     cmakeFlags = [
  -    # More tests not enabled by default
  -    ''-DZFP_BINARY_DIR=${placeholder "out"}''
  -    ''-DZFP_BUILD_TESTING_LARGE=ON''
  -  ]
  -    ++ lib.optionals targetPlatform.isDarwin [
  -      "-DCMAKE_INSTALL_BINDIR=bin"
  -      "-DCMAKE_INSTALL_LIBDIR=lib"
  -    ]
  -    ++ lib.optional enableCfp "-DBUILD_CFP=ON"
  +  ] ++ lib.optional enableCfp "-DBUILD_CFP=ON"
       ++ lib.optional enableCuda "-DZFP_WITH_CUDA=ON"
  -    ++ lib.optional enableExamples "-DBUILD_EXAMPLES=ON"
       ++ lib.optional enableFortran "-DBUILD_ZFORP=ON"
       ++ lib.optional enableOpenMP "-DZFP_WITH_OPENMP=ON"
       ++ lib.optional enablePython "-DBUILD_ZFPY=ON"
       ++ ([ "-DBUILD_UTILITIES=${if enableUtilities then "ON" else "OFF"}" ]);
  -
  -  preCheck = lib.optional targetPlatform.isDarwin ''
  -    export DYLD_LIBRARY_PATH="$out/lib:$DYLD_LIBRARY_PATH"
  -  '';
   
     doCheck = true;
   
  
positive.code: { cmake, cudatoolkit, fetchFromGitHub, gfortran, lib, llvmPackages, python3Packages, stdenv, targetPlatform
  , enableCfp ? true
  , enableCuda ? false
  , enableExamples ? true
  , enableFortran ? builtins.elem targetPlatform.system gfortran.meta.platforms
  , enableOpenMP ? true
  , enablePython ? true
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "zfp";
    version = "1.0.0";
  
    src = fetchFromGitHub {
      owner = "LLNL";
      repo = "zfp";
      rev = version;
      sha256 = "sha256-E2LI1rWo1HO5O/sxPHAmLDs3Z5xouzlgMj11rQFPNYQ=";
    };
  
    nativeBuildInputs = [ cmake ];
  