anchor.diff:    disDarwinOrArmFix = origArg: minVer: fixArg: if ((isDarwin || isAarch32) && reqMin minVer) then fixArg else origArg;
   
     vaapiSupport = reqMin "0.6" && ((isLinux || isFreeBSD) && !isAarch32);
  +
  +  vpxSupport = reqMin "0.6" && !isAarch32;
   in
   
   assert openglSupport -> libGLU_combined != null;
  
positive.code:       (ifMinVer "0.6" (enableFeature vaapiSupport "vaapi"))
        "--enable-vdpau"
        "--enable-libvorbis"
        (disDarwinOrArmFix (ifMinVer "0.6" "--enable-libvpx") "0.6" "--disable-libvpx")
        (ifMinVer "2.4" "--enable-lzma")
        (ifMinVer "2.2" (enableFeature openglSupport "opengl"))
        (disDarwinOrArmFix (ifMinVer "0.9" "--enable-libpulse") "0.9" "--disable-libpulse")
  
negative.code:  * see `ffmpeg-full' for an ffmpeg build with all features included.
   *
   * Need fixes to support Darwin:
   *   pulseaudio
   *
   * Known issues:
   * 0.6     - fails to compile (unresolved) (so far, only disabling a number of
  