diff --git a/tutorial/haxe/cpp.hxml b/tutorial/haxe/cpp.hxml
index 6adb52d..1b581a9 100644
--- a/tutorial/haxe/cpp.hxml
+++ b/tutorial/haxe/cpp.hxml
@@ -31,11 +31,11 @@
 #To produce 64 bit binaries the file should define the HXCPP_M64 compile variable:
 #-D HXCPP_M64
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/csharp.hxml b/tutorial/haxe/csharp.hxml
index 295c017..41d20ad 100644
--- a/tutorial/haxe/csharp.hxml
+++ b/tutorial/haxe/csharp.hxml
@@ -28,11 +28,11 @@
 #CSHARP target
 -cs bin/Tutorial.exe
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/flash.hxml b/tutorial/haxe/flash.hxml
index a1f0568..50c4a60 100644
--- a/tutorial/haxe/flash.hxml
+++ b/tutorial/haxe/flash.hxml
@@ -28,6 +28,9 @@
 #Flash target
 -swf bin/Tutorial.swf
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
@@ -35,7 +38,4 @@
 # --macro allowPackage("sys")
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/java.hxml b/tutorial/haxe/java.hxml
index c615565..1f810c7 100644
--- a/tutorial/haxe/java.hxml
+++ b/tutorial/haxe/java.hxml
@@ -28,11 +28,11 @@
 #Java target
 -java bin/Tutorial.jar
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/javascript.hxml b/tutorial/haxe/javascript.hxml
index b2b3876..b9a39bb 100644
--- a/tutorial/haxe/javascript.hxml
+++ b/tutorial/haxe/javascript.hxml
@@ -34,11 +34,11 @@
 #you modify your .hx files.
 -D source-map-content
 
+# libs
+-lib uuid
+
 #Generate source map and add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/neko.hxml b/tutorial/haxe/neko.hxml
index 6161f69..00b0556 100644
--- a/tutorial/haxe/neko.hxml
+++ b/tutorial/haxe/neko.hxml
@@ -28,11 +28,11 @@
 #neko target
 -neko bin/Tutorial.n
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file
diff --git a/tutorial/haxe/php-web-server.hxml b/tutorial/haxe/php-web-server.hxml
index c6e9432..4961cfa 100644
--- a/tutorial/haxe/php-web-server.hxml
+++ b/tutorial/haxe/php-web-server.hxml
@@ -39,7 +39,4 @@
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
diff --git a/tutorial/haxe/php.hxml b/tutorial/haxe/php.hxml
index 42bbf74..847da3b 100644
--- a/tutorial/haxe/php.hxml
+++ b/tutorial/haxe/php.hxml
@@ -29,11 +29,11 @@
 -php bin/php/
 -D php-front=Main-debug.php
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
diff --git a/tutorial/haxe/python.hxml b/tutorial/haxe/python.hxml
index f2c19fa..e591042 100644
--- a/tutorial/haxe/python.hxml
+++ b/tutorial/haxe/python.hxml
@@ -28,11 +28,11 @@
 #Python target
 -python bin/Tutorial.py
 
+# libs
+-lib uuid
+
 #Add debug information
 -debug
 
 #dead code elimination : remove unused code
-#"-dce no" : do not remove unused code
-#"-dce std" : remove unused code in the std lib (default)
-#"-dce full" : remove all unused code
 -dce full
\ No newline at end of file