diff --git a/bin/lutin b/bin/lutin
index 0f25e0f..862a0a7 100755
--- a/bin/lutin
+++ b/bin/lutin
@@ -34,6 +34,7 @@ myArgs.add(arguments.ArgDefine("P", "pretty", desc="Print the debug has pretty d
 myArgs.add(arguments.ArgDefine("j", "jobs", haveParam=True, desc="Specifies the number of jobs (commands) to run simultaneously"))
 myArgs.add(arguments.ArgDefine("d", "depth", haveParam=True, desc="Depth of the search of sub element lutin_*.py (default=" + str(env.get_parse_depth()) + ")"))
 myArgs.add(arguments.ArgDefine("s", "force-strip", desc="Force the stripping of the compile elements"))
+myArgs.add(arguments.ArgDefine("o", "force-optimisation", desc="Force optimisation of the build"))
 myArgs.add(arguments.ArgDefine("w", "warning", desc="Store warning in a file build file"))
 
 myArgs.add_section("properties", "keep in the sequency of the cible")
@@ -211,7 +212,14 @@ def parseGenericArg(argument, active):
 		return True
 	elif argument.get_option_name() == "force-build":
 		if active==True:
-			env.set_force_mode(True)
+			if    argument.get_arg() == "" \
+			   or argument.get_arg() == "1" \
+			   or argument.get_arg() == "true" \
+			   or argument.get_arg() == "True" \
+			   or argument.get_arg() == True:
+				env.set_force_mode(True)
+			else:
+				env.set_force_mode(False)
 		return True
 	elif argument.get_option_name() == "pretty":
 		if active==True:
@@ -224,6 +232,17 @@ def parseGenericArg(argument, active):
 			else:
 				env.set_print_pretty_mode(False)
 		return True
+	elif argument.get_option_name() == "force-optimisation":
+		if active==True:
+			if    argument.get_arg() == "" \
+			   or argument.get_arg() == "1" \
+			   or argument.get_arg() == "true" \
+			   or argument.get_arg() == "True" \
+			   or argument.get_arg() == True:
+				env.set_force_optimisation(True)
+			else:
+				env.set_force_optimisation(False)
+		return True
 	elif argument.get_option_name() == "force-strip":
 		if active==True:
 			if    argument.get_arg() == "" \
diff --git a/lutin/env.py b/lutin/env.py
index 3ecd5fb..f3efb90 100644
--- a/lutin/env.py
+++ b/lutin/env.py
@@ -26,6 +26,19 @@ def get_force_mode():
 	global force_mode
 	return force_mode
 
+force_optimisation=False
+
+def set_force_optimisation(val):
+	global force_optimisation
+	if val==1:
+		force_optimisation = 1
+	else:
+		force_optimisation = 0
+
+def get_force_optimisation():
+	global force_optimisation
+	return force_optimisation
+
 parse_depth = 9999999
 
 def set_parse_depth(val):
@@ -116,6 +129,19 @@ def print_pretty(my_string, force=False):
 			    "-classpath",
 			    "-sourcepath"
 			    ]
+		elif end_with(cmdApplication, ["java"]) == True:
+			baseElementList = [
+			    "-z",
+			    "-f",
+			    "-rf"
+			    ]
+		elif end_with(cmdApplication, ["jarsigner"]) == True:
+			baseElementList = [
+			    "-sigalg",
+			    "-digestalg",
+			    "-storepass",
+			    "-keypass"
+			    ]
 		elif end_with(cmdApplication, ["jar"]) == True:
 			baseElementList = [
 			    "cf",
diff --git a/lutin/target.py b/lutin/target.py
index 07ff06f..b2d4b69 100644
--- a/lutin/target.py
+++ b/lutin/target.py
@@ -107,9 +107,12 @@ class Target:
 		if "debug" == self.config["mode"]:
 			self.add_flag("c", [
 			    "-g",
-			    "-DDEBUG",
-			    "-O0"
+			    "-DDEBUG"
 			    ])
+			if env.get_force_optimisation() == False:
+				self.add_flag("c", "-O0")
+			else:
+				self.add_flag("c", "-O3")
 		else:
 			self.add_flag("c", [
 			    "-DNDEBUG",
diff --git a/lutin/z_builder/lutinBuilder_libraryDynamic.py b/lutin/z_builder/lutinBuilder_libraryDynamic.py
index e09ac54..94bcaf3 100644
--- a/lutin/z_builder/lutinBuilder_libraryDynamic.py
+++ b/lutin/z_builder/lutinBuilder_libraryDynamic.py
@@ -99,6 +99,10 @@ def link(file, binary, target, depancy, flags, name, basic_path, static=False):
 		cmd.append(file_src)
 	except:
 		pass
+	try:
+		cmd.append(list_static)
+	except:
+		pass
 	for view in ["local", "export"]:
 		if view not in flags:
 			continue
@@ -113,10 +117,6 @@ def link(file, binary, target, depancy, flags, name, basic_path, static=False):
 			cmd.append(target.global_flags[type])
 	if 'src' in depancy.src:
 		cmd.append(tools.filter_extention(depancy.src['src'], get_input_type()))
-	try:
-		cmd.append(list_static)
-	except:
-		pass
 	try:
 		for elem in list_dynamic:
 			lib_path = os.path.dirname(elem)
diff --git a/lutin/z_system/lutinSystem_Android_cxx.py b/lutin/z_system/lutinSystem_Android_cxx.py
index 8397b25..aed7b5b 100644
--- a/lutin/z_system/lutinSystem_Android_cxx.py
+++ b/lutin/z_system/lutinSystem_Android_cxx.py
@@ -48,6 +48,7 @@ class System(system.System):
 		else:
 			self.add_export_flag("c++", "-D__STDCPP_GNU__")
 			self.add_export_flag("c++-remove","-nostdlib")
+			self.add_export_flag("need-libstdc++", True)
 			# GPL v3 (+ exception link for gcc compilator)
 			self.add_export_path(os.path.join(target.path_ndk, "sources", "cxx-stl", "gnu-libstdc++", target.compilator_version, "include"))
 			if target.type_arch == "armv5":
diff --git a/lutin/z_system/lutinSystem_Android_z.py b/lutin/z_system/lutinSystem_Android_z.py
new file mode 100644
index 0000000..9f8e949
--- /dev/null
+++ b/lutin/z_system/lutinSystem_Android_z.py
@@ -0,0 +1,28 @@
+#!/usr/bin/python
+##
+## @author Edouard DUPIN
+##
+## @copyright 2012, Edouard DUPIN, all right reserved
+##
+## @license APACHE v2.0 (see license file)
+##
+
+from lutin import debug
+from lutin import system
+from lutin import tools
+import os
+
+class System(system.System):
+	def __init__(self, target):
+		system.System.__init__(self)
+		# create some HELP:
+		self.help="Z : z library \n Can be install with the package:\n    - zlib1g-dev"
+		# check if the library exist:
+		if not os.path.isfile("/usr/include/zlib.h"):
+			# we did not find the library reqiested (just return) (automaticly set at false)
+			return;
+		self.valid = True
+		# todo : create a searcher of the presence of the library:
+		self.add_export_flag("link-lib", "z")
+
+