anchor.diff:    buildInputs = [
       gfortran
       blas
  -    python
  +    python3
       boost
     ] ++ lib.optionals (!stdenv.isDarwin) [
       ocl-icd
  
positive.code:     OpenCL
    ];
  
    meta = with lib; {
      homepage = "https://github.com/clMathLibraries/clBLAS";
      description = "A software library containing BLAS functions written in OpenCL";
  
negative.code: , gfortran
  , blas
  , boost
  , python3
  , ocl-icd
  , opencl-headers
  , Accelerate, CoreGraphics, CoreVideo, OpenCL
  