diff --git a/SCsub b/SCsub
index 6b56edc..51e2202 100644
--- a/SCsub
+++ b/SCsub
@@ -4,6 +4,8 @@ Import('env')
 
 module_env = env.Clone()
 
+import version
+
 if os.path.isdir('../mesh_data_resource'):
     module_env.Append(CPPDEFINES=['MESH_DATA_RESOURCE_PRESENT'])
 
@@ -37,7 +39,6 @@ sources = [
     "props/prop_data_scene.cpp",
     "props/prop_data_light.cpp",
     "props/prop_data_prop.cpp",
-    "props/prop_data_portal.cpp",
     "props/prop_data_tiled_wall.cpp",
 
     "clutter/ground_clutter.cpp",
@@ -65,6 +66,9 @@ sources = [
     "material_cache/prop_material_cache.cpp"
 ]
 
+if version.minor >= 4:
+    sources.append("props/prop_data_portal.cpp")
+
 if has_texture_packer:
     sources.append("material_cache/prop_material_cache_pcm.cpp")
 
diff --git a/editor/prop_editor_plugin.cpp b/editor/prop_editor_plugin.cpp
index ec66ab3..1b3b478 100644
--- a/editor/prop_editor_plugin.cpp
+++ b/editor/prop_editor_plugin.cpp
@@ -82,6 +82,7 @@ void PropEditorPlugin::convert_scene(Node *root, const String &path) {
 }
 
 void PropEditorPlugin::find_room_points(Variant param) {
+#if VERSION_MINOR >= 4
 	SceneTree *st = SceneTree::get_singleton();
 
 	if (st) {
@@ -91,6 +92,7 @@ void PropEditorPlugin::find_room_points(Variant param) {
 			PropUtils::get_singleton()->generate_room_points_node(scene);
 		}
 	}
+#endif
 }
 
 void PropEditorPlugin::_quick_convert_button_pressed() {
@@ -110,7 +112,9 @@ PropEditorPlugin::PropEditorPlugin(EditorNode *p_node) {
 #if VERSION_MAJOR < 4
 	editor->add_tool_menu_item("Convert active scene to PropData", this, "convert_active_scene_to_prop_data");
 	editor->add_tool_menu_item("Convert selected scene(s) to PropData", this, "convert_selected_scene_to_prop_data");
+#if VERSION_MINOR >= 4
 	editor->add_tool_menu_item("(Prop) Find room points.", this, "find_room_points");
+#endif
 #else
 #endif
 
diff --git a/register_types.cpp b/register_types.cpp
index 22bff98..234b90c 100644
--- a/register_types.cpp
+++ b/register_types.cpp
@@ -36,11 +36,14 @@ SOFTWARE.
 #include "props/prop_data.h"
 #include "props/prop_data_entry.h"
 #include "props/prop_data_light.h"
-#include "props/prop_data_portal.h"
 #include "props/prop_data_prop.h"
 #include "props/prop_data_scene.h"
 #include "props/prop_data_tiled_wall.h"
 
+#if VERSION_MINOR >= 4
+#include "props/prop_data_portal.h"
+#endif
+
 #include "clutter/ground_clutter.h"
 #include "clutter/ground_clutter_foliage.h"
 
@@ -85,9 +88,12 @@ void register_props_types() {
 	ClassDB::register_class<PropDataScene>();
 	ClassDB::register_class<PropDataLight>();
 	ClassDB::register_class<PropDataProp>();
-	ClassDB::register_class<PropDataPortal>();
 	ClassDB::register_class<PropDataTiledWall>();
 
+#if VERSION_MINOR >= 4
+	ClassDB::register_class<PropDataPortal>();
+#endif
+
 	ClassDB::register_class<GroundClutter>();
 	ClassDB::register_class<GroundClutterFoliage>();
 
@@ -129,8 +135,10 @@ void register_props_types() {
 	Ref<PropDataScene> scene_processor = Ref<PropDataScene>(memnew(PropDataScene));
 	PropUtils::add_processor(scene_processor);
 
+#if VERSION_MINOR >= 4
 	Ref<PropDataPortal> portal_processor = Ref<PropDataPortal>(memnew(PropDataPortal));
 	PropUtils::add_processor(portal_processor);
+#endif
 
 	Ref<PropDataTiledWall> tiled_wall_processor = Ref<PropDataTiledWall>(memnew(PropDataTiledWall));
 	PropUtils::add_processor(tiled_wall_processor);
diff --git a/singleton/prop_utils.cpp b/singleton/prop_utils.cpp
index 7a69f95..dffa3bc 100644
--- a/singleton/prop_utils.cpp
+++ b/singleton/prop_utils.cpp
@@ -25,15 +25,16 @@ SOFTWARE.
 #include "../props/prop_data.h"
 #include "../props/prop_data_entry.h"
 
-#include "scene/3d/room.h"
-
 #include "core/version.h"
+
+#if VERSION_MINOR >= 4
+#include "core/math/quick_hull.h"
+#include "scene/3d/portal.h"
 #include "scene/3d/room.h"
 #include "scene/3d/room_manager.h"
+#endif
 
-#include "core/math/quick_hull.h"
 #include "scene/3d/mesh_instance.h"
-#include "scene/3d/portal.h"
 
 #if MESH_DATA_RESOURCE_PRESENT
 #include "../../mesh_data_resource/nodes/mesh_data_instance.h"
@@ -46,7 +47,7 @@ SOFTWARE.
 #endif
 
 PropUtils *PropUtils::_instance;
-Vector<Ref<PropDataEntry>> PropUtils::_processors;
+Vector<Ref<PropDataEntry> > PropUtils::_processors;
 
 PropUtils *PropUtils::get_singleton() {
 	return _instance;
@@ -106,6 +107,7 @@ void PropUtils::_convert_tree(Ref<PropData> prop_data, Node *node, const Transfo
 			}
 		}
 	} else {
+#if VERSION_MINOR >= 4
 		//only handle the first encountered room per prop
 		if (!prop_data->get_is_room()) {
 			Room *r = Object::cast_to<Room>(sp);
@@ -118,6 +120,7 @@ void PropUtils::_convert_tree(Ref<PropData> prop_data, Node *node, const Transfo
 				prop_data->set_room_bounds(points);
 			}
 		}
+#endif
 
 		for (int i = 0; i < node->get_child_count(); ++i) {
 			Node *child = node->get_child(i);
@@ -134,6 +137,7 @@ void PropUtils::_convert_tree(Ref<PropData> prop_data, Node *node, const Transfo
 	}
 }
 
+#if VERSION_MINOR >= 4
 bool PropUtils::generate_room_points_node(Node *node) {
 	ERR_FAIL_COND_V(!ObjectDB::instance_validate(node), false);
 
@@ -157,7 +161,7 @@ bool PropUtils::generate_room_points_node(Node *node) {
 void PropUtils::generate_room_points(Room *room) {
 	ERR_FAIL_COND(!ObjectDB::instance_validate(room));
 
-	Vector<PoolVector<Vector3>> mesh_arrays;
+	Vector<PoolVector<Vector3> > mesh_arrays;
 
 	get_mesh_arrays(room, &mesh_arrays);
 
@@ -302,7 +306,7 @@ bool PropUtils::is_plane_unique(const PoolVector<Plane> &planes, const Plane &p)
 	return true;
 }
 
-void PropUtils::get_mesh_arrays(Node *node, Vector<PoolVector<Vector3>> *arrs) {
+void PropUtils::get_mesh_arrays(Node *node, Vector<PoolVector<Vector3> > *arrs) {
 	ERR_FAIL_COND(!ObjectDB::instance_validate(node));
 
 	for (int i = 0; i < node->get_child_count(); ++i) {
@@ -456,6 +460,8 @@ void PropUtils::get_mesh_arrays(Node *node, Vector<PoolVector<Vector3>> *arrs) {
 	}
 }
 
+#endif
+
 int PropUtils::add_processor(const Ref<PropDataEntry> &processor) {
 	ERR_FAIL_COND_V(!processor.is_valid(), 0);
 
diff --git a/singleton/prop_utils.h b/singleton/prop_utils.h
index f86b442..6fb147f 100644
--- a/singleton/prop_utils.h
+++ b/singleton/prop_utils.h
@@ -41,7 +41,10 @@ SOFTWARE.
 
 class PropData;
 class PropDataEntry;
+
+#if VERSION_MINOR >= 4
 class Room;
+#endif
 
 class PropUtils : public Object {
 	GDCLASS(PropUtils, Object);
@@ -52,11 +55,12 @@ public:
 	Ref<PropData> convert_tree(Node *root);
 	void _convert_tree(Ref<PropData> prop_data, Node *node, const Transform &transform);
 
+#if VERSION_MINOR >= 4
 	bool generate_room_points_node(Node *node);
 	void generate_room_points(Room *room);
 	void get_mesh_arrays(Node *node, Vector<PoolVector<Vector3>> *arrs);
 	bool is_plane_unique(const PoolVector<Plane> &planes, const Plane &p);
-
+#endif
 
 	static int add_processor(const Ref<PropDataEntry> &processor);
 	static Ref<PropDataEntry> get_processor(const int index);
diff --git a/tiled_wall/tiled_wall.cpp b/tiled_wall/tiled_wall.cpp
index 294e021..b1488ee 100644
--- a/tiled_wall/tiled_wall.cpp
+++ b/tiled_wall/tiled_wall.cpp
@@ -2,7 +2,6 @@
 
 #include "core/version.h"
 
-#include "core/version.h"
 #include "scene/resources/texture.h"
 
 #if VERSION_MAJOR < 4
@@ -290,8 +289,10 @@ TiledWall::TiledWall() {
 
 	_physics_body_rid = PhysicsServer::get_singleton()->body_create(PhysicsServer::BODY_MODE_STATIC);
 
+#if VERSION_MINOR >= 4
 	//temporary
 	set_portal_mode(PORTAL_MODE_GLOBAL);
+#endif
 
 	_mesher.instance();
 }