anchor.diff:      version = fetchVersion;
     };
   
  -
     nativeBuildInputs = [
       cmake
  -    #ninja
       perl
       pythonPackages.sphinx
       python2Packages.python
  +    python2Packages.wrapPython
       python3Packages.cython
       python3Packages.python
       yasm
  
positive.code: }:
  
  let
    inherit ((import ./sources.nix)."${channel}")
      fetchVersion
      rev
  
negative.code: { stdenv
  , cmake
  , fetchgit
  , perl
  , pythonPackages
  , python2Packages
  