depends expat                     &&
depends zlib "--with-zlib=system" &&

optional_depends libusb-compat "--with-libusb" "--without-libusb" "support for libusb" &&

optional_depends qtbase "" "" "for GUI support" &&
if is_depends_enabled $SPELL qtbase; then
  depends -sub CXX gcc &&
  depends qttools
fi &&
optional_depends perl "" "" "to install documentation"
