python3Packages.bitsandbytes: move env vars into env for structuredAttrs

    (lib.cmakeFeature "CMAKE_HIP_ARCHITECTURES" (builtins.concatStringsSep ";" rocmGpuTargets))

  ];

  CUDA_HOME = lib.optionalString cudaSupport "${cuda-native-redist}";

  NVCC_PREPEND_FLAGS = lib.optionals cudaSupport [

  env = lib.optionalAttrs cudaSupport {

    CUDA_HOME = cuda-native-redist;

    NVCC_PREPEND_FLAGS = toString [

      "-I${cuda-native-redist}/include"

      "-L${cuda-native-redist}/lib"

    ];

  };

  preBuild = ''

    make -j $NIX_BUILD_CORES