anchor.diff:   *  Licensing options (yes some are listed twice, filters and such are not listed)
    */
   , gplLicensing ? true # GPL: fdkaac,openssl,frei0r,cdio,samba,utvideo,vidstab,x265,x265,xavs,avid,zvbi,x11grab
  -, version3Licensing ? true # (L)GPL3: opencore-amrnb,opencore-amrwb,samba,vo-aacenc,vo-amrwbenc
  +, version3Licensing ? true # (L)GPL3: libvmaf,opencore-amrnb,opencore-amrwb,samba,vo-aacenc,vo-amrwbenc
   , nonfreeLicensing ? false # NONFREE: openssl,fdkaac,blackmagic-design-desktop-video
   /*
    *  Build options
  
positive.code:     (enableFeature ((isLinux || isFreeBSD) && libva != null) "vaapi")
      (enableFeature (libvdpau != null) "vdpau")
      (enableFeature (libvorbis != null) "libvorbis")
      (enableFeature (libvpx != null) "libvpx")
      (enableFeature (libwebp != null) "libwebp")
      (enableFeature (libX11 != null && libXv != null && libXext != null) "xlib")
  
negative.code:   ] ++ optional openglExtlib libGLU_combined
      ++ optionals nonfreeLicensing [ fdk_aac openssl ]
      ++ optional ((isLinux || isFreeBSD) && libva != null) libva
      ++ optional (libvmaf != null  && version3Licensing ) libvmaf
      ++ optionals isLinux [ alsaLib libraw1394 libv4l ]
      ++ optional (isLinux && !isAarch64 && libmfx != null) libmfx
      ++ optional nvenc nv-codec-headers
  