anchor.diff:  }:
   
   assert advancedProcessing -> (
  -  opencv != null && scikitimage != null && scikitlearn != null
  +  opencv3 != null && scikitimage != null && scikitlearn != null
     && scipy != null && matplotlib != null && youtube-dl != null);
   
   buildPythonPackage rec {
  
positive.code:   propagatedBuildInputs = [
      numpy decorator imageio imageio-ffmpeg tqdm requests proglog
    ] ++ (stdenv.lib.optionals advancedProcessing [
      opencv scikitimage scikitlearn scipy matplotlib youtube-dl
    ]);
  
    meta = with stdenv.lib; {
  
negative.code: , tqdm
  # Advanced image processing (triples size of output)
  , advancedProcessing ? false
  , opencv3 ? null
  , scikitimage ? null
  , scikitlearn ? null
  , scipy ? null
  