anchor.diff:      "--${boolEn (snappy != null)}-libsnappy"
       "--${boolEn (soxr != null)}-libsoxr"
       "--${boolEn (speex != null)}-libspeex"
  -    /**/(fflag "--disable-libsrt" "3.5")
  +    /**/(fflag "--disable-libsrt" "4.0")
       "--${boolEn (libssh != null)}-libssh"
       #"--${boolEn (tesseract != null)}-libtesseract"
       /**/"--disable-libtesseract"
       "--${boolEn (libtheora != null)}-libtheora"
  -    /**/(fflag "--disable-libtls" "3.5")  # libressl
  +    /**/(fflag "--disable-libtls" "4.0")  # libressl
       #"--${boolEn (twolame != null)}-libtwolame"
       /**/"--disable-libtwolame"
       "--${boolEn (v4l_lib != null)}-libv4l2"
       (deprfflag "--${boolEn (v4l_lib != null)}-v4l2_m2m" null "3.4")
  -    (fflag "--${boolEn (v4l_lib != null)}-v4l2-m2m" "3.5")
  +    (fflag "--${boolEn (v4l_lib != null)}-v4l2-m2m" "4.0")
       "--${boolEn (vid-stab != null)}-libvidstab"
       /**/"--disable-libvmaf"
       "--${boolEn (vo-amrwbenc != null)}-libvo-amrwbenc"
  
positive.code:     "--${boolEn (libgcrypt != null)}-gcrypt"
      "--${boolEn (gmp != null)}-gmp"
      "--${boolEn (gnutls != null)}-gnutls"
      (fflag "--${boolEn (aomedia != null)}-libaom" "3.5")
      "--${boolEn (stdenv.cc.libc != null)}-iconv"
      (deprfflag "--${boolEn (jack2_lib != null)}-jack" null "3.4")
      "--${boolEn (jni != null)}-jni"
  
negative.code:     };
      "9.9" = {  # Git
        fetchzipversion = 6;
        version = "2018.04.30";
        rev = "0807a771600956e1f3e36a202fd3877418541eb0";
        sha256 = "90a0a74d616c5334439f951e0a2496a36eb026e3c23f310f75e652427d91a810";
      };
    };
    source = sources."${channel}";
  