anchor.diff:      "--disable-libiec61883"
       #"--${boolEn (ilbc != null)}-libilbc"
       "--disable-libilbc"
  +    (fflag "--${boolEn (jack2_lib != null)}-libjack" "3.5")
       "--${boolEn (kvazaar != null)}-libkvazaar"
       "--${boolEn (libmodplug != null)}-libmodplug"
       "--${boolEn (lame != null)}-libmp3lame"
  
positive.code:     "--${boolEn (gmp != null)}-gmp"
      "--${boolEn (gnutls != null)}-gnutls"
      "--${boolEn (stdenv.cc.libc != null)}-iconv"
      "--${boolEn (jack2_lib != null)}-jack"
      "--${boolEn (jni != null)}-jni"
      "--${boolEn (ladspa-sdk != null)}-ladspa"
      "--${boolEn (libass != null)}-libass"
  
negative.code:       sha256 = "aeee06e4d8b18d852c61ebbfe5e1bb7014b1e118e8728c1c2115f91e51bffbef";
      };
      "9.9" = { # Git
        version = "2017.11.01";
        rev = "5ab41a25ba9ce2b3a8b5d22930161042718d7f84";
        sha256 = "ecf342adce1603c73b269e2f189ace100e8b51cc2c8cfadee539851707894ddb";
      };
    };
    source = sources."${channel}";
  