anchor.diff:        sha256 = "5a77278a63741efa74e26bf197b9bb09ac6381b9757391b922407210f0f991c0";
       };
       "9.9" = { # Git
  -      version = "2017.12.05";
  -      rev = "c8bd2c7d09bfc71795e91f0a9aeb4b8a6833eff2";
  -      sha256 = "9d4aef0488e5744247c890194e1c5b5bba90182bbc2234dac72f43cf7a2f3a3b";
  +      version = "2017.12.15";
  +      rev = "3c6dc270355f27645cf931fae1ed2dc1405507f8";
  +      sha256 = "64f9b15adaf585ddca918db9bb6e202ccc795c56579ce70b2f9fe075d5c043fa";
       };
     };
     source = sources."${channel}";
  
positive.code:     /*
       *  Hardware accelerators
       */
      (fflag "--disable-amf" "3.5")  # macOS
      "--disable-audiotoolbox"  # macOS
      "--${boolEn (
        nvidia-cuda-toolkit != null
  
negative.code:     #"--${boolEn (twolame != null)}-libtwolame"
      /**/"--disable-libtwolame"
      "--${boolEn (v4l_lib != null)}-libv4l2"
      (deprfflag "--${boolEn (v4l_lib != null)}-v4l2_m2m" null "3.4")
      (fflag "--${boolEn (v4l_lib != null)}-v4l2-m2m" "3.5")
      "--${boolEn (vid-stab != null)}-libvidstab"
      /**/"--disable-libvmaf"
      "--${boolEn (vo-amrwbenc != null)}-libvo-amrwbenc"
  