if both gloopblocks and moreblocks present, don't register "gravel spread"

alias it to gloopblocks:slab_gravel_1

building_blocks/alias.lua

@@ -19,6 +19,10 @@ if minetest.get_modpath("moreblocks") then
 	minetest.unregister_item("moreblocks:tar")
 	minetest.register_alias("moreblocks:tar", "building_blocks:Tar")
 	stairsplus:register_alias_all("moreblocks", "tar", "building_blocks", "Tar")
+
+	if minetest.get_modpath("gloopblocks") then
+		minetest.register_alias("building_blocks:gravel_spread", "gloopblocks:slab_gravel_1")
+	end
 end
 
 minetest.register_alias("adobe", "building_blocks:Adobe")

building_blocks/depends.txt

@@ -1,4 +1,5 @@
 default
 homedecor_i18n
 moreblocks?
+gloopblocks?
 stairs?

building_blocks/node_stairs.lua

@@ -131,6 +131,8 @@ minetest.register_node("building_blocks:brobble_spread", {
 	is_ground_content = true,
 	groups = {crumbly=3},
 })
+
+if not minetest.get_modpath("moreblocks") or not minetest.get_modpath("gloopblocks") then
 	minetest.register_node("building_blocks:gravel_spread", {
 		drawtype = "raillike",
 		description = S("Gravel Spread"),
@@ -151,6 +153,8 @@ minetest.register_node("building_blocks:gravel_spread", {
 			dug = {name="default_gravel_footstep", gain=1.0},
 		}),
 	})
+end
+
 minetest.register_node("building_blocks:Tarmac_spread", {
 	drawtype = "raillike",
 	description = S("Tarmac Spread"),

building_blocks/recipes.lua

@@ -60,12 +60,16 @@ minetest.register_craft({
 		{"default:glass", "default:glass"},
 	}
 })
+
+if not minetest.get_modpath("moreblocks") or not minetest.get_modpath("gloopblocks") then
 	minetest.register_craft({
 		output = 'building_blocks:gravel_spread 4',
 		recipe = {
 			{"default:gravel", "default:gravel", "default:gravel"},
 		}
 	})
+end
+
 minetest.register_craft({
 	output = 'building_blocks:hardwood 2',
 	recipe = {