anchor.diff:  { stdenv
   , fetchFromGitHub
   , fetchurl
  +, lib
   , perl
   , texinfo
   , yasm
  
positive.code: let
    inherit (builtins)
      compareVersions;
    inherit (stdenv.lib)
      boolEn
      optional
      optionals
  
negative.code: , mfx-dispatcher
  , mmal ? null
  , netcdf ? null
  , nvenc ? false
  , nvidia-cuda-toolkit
  , nvidia-drivers
  , openal
  