diff --git a/.gitmodules b/.gitmodules
index bb6fb9b4..9a3356df 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -14,9 +14,6 @@
 [submodule "external/png"]
 	path = external/png
 	url = https://github.com/HeeroYui/libpng.git
-[submodule "external/z/zlib"]
-	path = external/z/zlib
-	url = https://github.com/HeeroYui/zlib.git
 [submodule "external/bullet/bullet"]
 	path = external/bullet/bullet
 	url = https://github.com/HeeroYui/bullet.git
diff --git a/external/audio-algo-drain b/external/audio-algo-drain
index e3e048f6..fd8d7ab7 160000
--- a/external/audio-algo-drain
+++ b/external/audio-algo-drain
@@ -1 +1 @@
-Subproject commit e3e048f68a766e9236ea27fb0ee362e0ab6c2770
+Subproject commit fd8d7ab7e8b42dbfe69db699bb00bac2a4341bea
diff --git a/external/audio-drain b/external/audio-drain
index 154d03e8..ab7f5ac7 160000
--- a/external/audio-drain
+++ b/external/audio-drain
@@ -1 +1 @@
-Subproject commit 154d03e8bd80bb2e70b6abb4e2675aed9f300bdf
+Subproject commit ab7f5ac77121aaa5b7c5690ba47ca9abc0dff497
diff --git a/external/z/lutin_minizip.py b/external/z/lutin_minizip.py
deleted file mode 100644
index c5df6729..00000000
--- a/external/z/lutin_minizip.py
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/usr/bin/python
-import lutinModule as module
-import lutinTools as tools
-
-def get_desc():
-	return "MINIZIP : Small zip interface"
-
-
-def create(target):
-	myModule = module.Module(__file__, 'minizip', 'LIBRARY')
-	myModule.add_src_file([
-		"zlib/contrib/minizip/unzip.c",
-		"zlib/contrib/minizip/zip.c",
-		"zlib/contrib/minizip/miniunz.c",
-		"zlib/contrib/minizip/ioapi.c"])
-	
-	myModule.add_export_path(tools.get_current_path(__file__) + "/zlib/contrib/")
-	
-	myModule.add_module_depend('z')
-	
-	myModule.compile_version_CC(1999)
-	
-	myModule.compile_flags_CC([
-		"-DNOCRYPT",
-		"-DIOAPI_NO_64"])
-	
-	if target.name=="IOs" or target.name=="MacOs":
-		myModule.compile_flags_CC("-Wno-implicit-function-declaration")
-	
-	# add the currrent module at the 
-	return myModule
-
-
diff --git a/external/z/lutin_z.py b/external/z/lutin_z.py
deleted file mode 100644
index edcedd58..00000000
--- a/external/z/lutin_z.py
+++ /dev/null
@@ -1,46 +0,0 @@
-#!/usr/bin/python
-import lutinModule as module
-import lutinTools as tools
-
-def get_desc():
-	return "z-lib library (for windows)"
-
-
-def create(target):
-	if target.name=="Windows":
-		myModule = module.Module(__file__, 'z', 'LIBRARY')
-		myModule.add_src_file([
-			"zlib/adler32.c",
-			"zlib/crc32.c",
-			"zlib/deflate.c",
-			"zlib/infback.c",
-			"zlib/inffast.c",
-			"zlib/inflate.c",
-			"zlib/inftrees.c",
-			"zlib/trees.c",
-			"zlib/zutil.c",
-			"zlib/compress.c",
-			"zlib/uncompr.c",
-			"zlib/gzclose.c",
-			"zlib/gzlib.c",
-			"zlib/gzread.c",
-			"zlib/gzwrite.c"])
-		
-		myModule.add_export_path(tools.get_current_path(__file__))
-		myModule.add_export_path(tools.get_current_path(__file__) + "/zlib")
-		
-		
-		myModule.compile_flags_CC([
-			"-D_LARGEFILE64_SOURCE=1",
-			"-DHAVE_HIDDEN"])
-		
-		# add the currrent module at the 
-		return myModule
-	else:
-		myModule = module.Module(__file__, 'z', 'PREBUILD')
-		
-		myModule.add_export_flag_LD('-lz')
-		# add the currrent module at the 
-		return myModule
-
-
diff --git a/external/z/zlib b/external/z/zlib
deleted file mode 160000
index d28591c2..00000000
--- a/external/z/zlib
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit d28591c2dc88a09473b2ad3f5e82ad20a0dec4b8