Change recipe when basic_materials mod is detected

depends.txt

@@ -1,3 +1,4 @@
 default
 signs_lib?
-locks?
+locks?
+basic_materials?

mod.conf

@@ -0,0 +1,3 @@
+name = arrow_signs
+depends = default
+optional_depends = signs_lib,locks,basic_materials

shared_locked.lua

@@ -5,7 +5,7 @@
 	To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
 ]]
 minetest.register_node("arrow_signs:shared_locked", {
-	description = "Shared locked sign",
+	description = "Shared locked arrow sign",
 	drawtype = "nodebox",
 	node_box = arrow_signs.nodebox,
 	selection_box = arrow_signs.selection_box,
@@ -69,7 +69,7 @@ minetest.register_node("arrow_signs:shared_locked", {
 minetest.register_craft({
 	type = 'shapeless',
 	output = 'arrow_signs:shared_locked',
-	recipe = {'arrow_signs:wall', 'locks:lock'},
+	recipe = {'arrow_signs:wall', 'locks:lock', minetest.get_modpath("basic_materials") and "basic_materials:ic" or ""},
 })
 
 --Redefinition