system-configuration-features

system-configuration-features is a variable defined in `C source code'.
Its value is

"XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB"

Documentation:
String listing some of the main features this Emacs was compiled with.
An element of the form "FOO" generally means that HAVE_FOO was
defined during the build.