diff --git a/ext/tox/extconf.rb b/ext/tox/extconf.rb
index 6fb1c32..1a7d3b0 100755
--- a/ext/tox/extconf.rb
+++ b/ext/tox/extconf.rb
@@ -8,6 +8,7 @@ LIBTOXCORE = 'toxcore'
 
 have_header 'time.h' and
 have_header 'tox/tox.h' and
+have_header 'tox/tox_old.h' and
 
 have_func 'sprintf' and
 have_func 'sscanf' and
@@ -27,5 +28,9 @@ have_library LIBTOXCORE, 'tox_friend_add_norequest' and
 have_library LIBTOXCORE, 'tox_friend_send_message' and
 have_library LIBTOXCORE, 'tox_callback_friend_request' and
 have_library LIBTOXCORE, 'tox_callback_friend_message' and
+have_library LIBTOXCORE, 'tox_join_groupchat' and
+have_library LIBTOXCORE, 'tox_group_message_send' and
+have_library LIBTOXCORE, 'tox_callback_group_invite' and
+have_library LIBTOXCORE, 'tox_callback_group_message' and
 
 create_makefile "#{NAME}/#{NAME}" or exit(1)