anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "zfp";
  -  version = "0.5.5";
  +  version = "1.0.0";
   
     src = fetchFromGitHub {
       owner = "LLNL";
       repo = "zfp";
       rev = version;
  -    sha256 = "19ycflz35qsrzfcvxdyy0mgbykfghfi9y5v684jb4awjp7nf562c";
  +    sha256 = "sha256-E2LI1rWo1HO5O/sxPHAmLDs3Z5xouzlgMj11rQFPNYQ=";
     };
   
     nativeBuildInputs = [ cmake ];
  
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:     ++ 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 = [
    ] ++ lib.optional enableCfp "-DBUILD_CFP=ON"
      ++ lib.optional enableCuda "-DZFP_WITH_CUDA=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"}" ]);
  
    doCheck = true;
  
  