anchor.diff:      "--disable-libiec61883"
       #"--${boolEn (ilbc != null)}-libilbc"
       "--disable-libilbc"
  -    (fflag "--${boolEn (jack2_lib != null)}-libjack" "3.5")
  +    (fflag "--${boolEn (jack2_lib != null)}-libjack" "4.0")
       "--${boolEn (kvazaar != null)}-libkvazaar"
       "--${boolEn (libmodplug != null)}-libmodplug"
       "--${boolEn (lame != null)}-libmp3lame"
  
positive.code:     };
      "9.9" = {  # Git
        fetchzipversion = 6;
        version = "2018.04.11";
        rev = "a26c9fdd1b4c047d6c89e29774928fd7bf347e8b";
        sha256 = "70cab5aa0029ce65112f295425911daac9c8af87155b9709e6c548e01a5e0c09";
      };
    };
    source = sources."${channel}";
  
negative.code:     "--${boolEn (zeromq4 != null)}-libzmq"
      #"--${boolEn (zvbi != null)}-libzvbi"
      /**/"--disable-libzvbi"
      /**/(fflag "--disable-lv2" "4.0")
      "--${boolEn (xz != null)}-lzma"
      #"--${boolEn decklinkExtlib}-decklink"
      /**/"--disable-decklink"
      /**/"--disable-libndi_newtek"
      #/**/(fflag "--disable-mbedtls" "4.1")
      "--disable-mediacodec"  # android
      "--${boolEn (libmysofa != null)}-libmysofa"
      "--${boolEn (openal != null)}-openal"
  