depends boost  &&
depends libxml2 &&
depends -sub CXX gcc &&
depends JPEG   &&

optional_depends gdk-pixbuf2 \
                 "--enable-gnome" \
                 "--disable-gnome" \
                 "for GNOME support" &&

if is_depends_enabled $SPELL gdk-pixbuf2; then
  depends glib2  &&
  depends libffi &&
  depends libpng &&
  depends pcre   &&
  depends zlib
fi