anchor.diff:      use_system_libexif = true;
       use_system_libjpeg = true;
       use_system_libpng = true;
  +    use_system_libusb = true;
       use_system_libxml = true;
       use_system_speex = true;
       use_system_ssl = cfg.openssl;
  
positive.code:     libevent expat libjpeg
      libpng libxml2 libxslt
      xdg_utils yasm zlib
      libexif
    ];
  
    maybeSeccompPatch = let
  
negative.code: , libevent, expat, libjpeg
  , libpng, libxml2, libxslt
  , xdg_utils, yasm, zlib
  , libusb1, libexif
  
  , python, perl, pkgconfig
  , nspr, udev, krb5
  