anchor.diff:      /*
        *  Hardware accelerators
        */
  +    (fflag "--disable-amf" "3.5")  # macOS
       "--disable-audiotoolbox"  # macOS
       "--${boolEn (
         nvidia-cuda-toolkit != null
  
positive.code:       sha256 = "aeee06e4d8b18d852c61ebbfe5e1bb7014b1e118e8728c1c2115f91e51bffbef";
      };
      "9.9" = { # Git
        version = "2017.11.11";
        rev = "fb94e7b39a170d4b7fdf66e5d997525a76f12ab2";
        sha256 = "e96d9717b57000627652074fbedd6723cd8507f5ea05788b4b5b48586774f026";
      };
    };
    source = sources."${channel}";
  
negative.code:     "--${boolEn (zeromq4 != null)}-libzmq"
      #"--${boolEn (zvbi != null)}-libzvbi"
      /**/"--disable-libzvbi"
      /**/(fflag "--disable-lv2" "3.4")
      "--${boolEn (xz != null)}-lzma"
      #"--${boolEn decklinkExtlib}-decklink"
      /**/"--disable-decklink"
  