diff --git a/lutin/z_system/lutinSystem_MacOs_c.py b/lutin/z_system/lutinSystem_MacOs_c.py
index 84d9df7..73d4d60 100644
--- a/lutin/z_system/lutinSystem_MacOs_c.py
+++ b/lutin/z_system/lutinSystem_MacOs_c.py
@@ -21,4 +21,193 @@ class System(system.System):
 		self.set_help("C: Generic C library")
 		self.add_flag("c-remove","-nodefaultlibs")
 		self.set_valid(True)
+		if env.get_isolate_system() == False:
+			# We must have it ... all time
+			pass
+		else:
+			# grep "This file is part of the GNU C Library" /usr/include/*
+			self.add_header_file([
+			    '/usr/include/aio.h*',
+			    '/usr/include/aliases.h*',
+			    '/usr/include/alloca.h*',
+			    '/usr/include/ansidecl.h*',
+			    '/usr/include/argp.h*',
+			    '/usr/include/argz.h*',
+			    '/usr/include/ar.h*',
+			    '/usr/include/assert.h*',
+			    '/usr/include/byteswap.h*',
+			    '/usr/include/complex.h*',
+			    '/usr/include/cpio.h*',
+			    '/usr/include/ctype.h*',
+			    '/usr/include/dirent.h*',
+			    '/usr/include/dlfcn.h*',
+			    '/usr/include/elf.h*',
+			    '/usr/include/endian.h*',
+			    '/usr/include/envz.h*',
+			    '/usr/include/err.h*',
+			    '/usr/include/errno.h*',
+			    '/usr/include/error.h*',
+			    '/usr/include/execinfo.h*',
+			    '/usr/include/fcntl.h*',
+			    '/usr/include/features.h*',
+			    '/usr/include/fenv.h*',
+			    '/usr/include/fmtmsg.h*',
+			    '/usr/include/fnmatch.h*',
+			    '/usr/include/fpu_control.h*',
+			    '/usr/include/fts.h*',
+			    '/usr/include/ftw.h*',
+			    '/usr/include/gconv.h*',
+			    '/usr/include/getopt.h*',
+			    '/usr/include/glob.h*',
+			    '/usr/include/gnu-versions.h*',
+			    '/usr/include/grp.h*',
+			    '/usr/include/gshadow.h*',
+			    '/usr/include/iconv.h*',
+			    '/usr/include/ieee754.h*',
+			    '/usr/include/ifaddrs.h*',
+			    '/usr/include/inttypes.h*',
+			    '/usr/include/langinfo.h*',
+			    '/usr/include/libgen.h*',
+			    '/usr/include/libintl.h*',
+			    '/usr/include/libio.h*',
+			    '/usr/include/limits.h*',
+			    '/usr/include/link.h*',
+			    '/usr/include/locale.h*',
+			    '/usr/include/malloc.h*',
+			    '/usr/include/mcheck.h*',
+			    '/usr/include/memory.h*',
+			    '/usr/include/mntent.h*',
+			    '/usr/include/monetary.h*',
+			    '/usr/include/mqueue.h*',
+			    '/usr/include/netdb.h*',
+			    '/usr/include/nl_types.h*',
+			    '/usr/include/nss.h*',
+			    '/usr/include/obstack.h*',
+			    '/usr/include/printf.h*',
+			    '/usr/include/pthread.h*',
+			    '/usr/include/pty.h*',
+			    '/usr/include/pwd.h*',
+			    '/usr/include/re_comp.h*',
+			    '/usr/include/regex.h*',
+			    '/usr/include/regexp.h*',
+			    '/usr/include/sched.h*',
+			    '/usr/include/search.h*',
+			    '/usr/include/semaphore.h*',
+			    '/usr/include/setjmp.h*',
+			    '/usr/include/sgtty.h*',
+			    '/usr/include/shadow.h*',
+			    '/usr/include/signal.h*',
+			    '/usr/include/spawn.h*',
+			    '/usr/include/stdc-predef.h*',
+			    '/usr/include/stdint.h*',
+			    '/usr/include/stdio_ext.h*',
+			    '/usr/include/stdio.h*',
+			    '/usr/include/stdlib.h*',
+			    '/usr/include/string.h*',
+			    '/usr/include/strings.h*',
+			    '/usr/include/stropts.h*',
+			    '/usr/include/tar.h*',
+			    '/usr/include/termios.h*',
+			    '/usr/include/tgmath.h*',
+			    '/usr/include/thread_db.h*',
+			    '/usr/include/time.h*',
+			    '/usr/include/uchar.h*',
+			    '/usr/include/ucontext.h*',
+			    '/usr/include/ulimit.h*',
+			    '/usr/include/unistd.h*',
+			    '/usr/include/utime.h*',
+			    '/usr/include/utmp.h*',
+			    '/usr/include/utmpx.h*',
+			    '/usr/include/values.h*',
+			    '/usr/include/wchar.h*',
+			    '/usr/include/wctype.h*',
+			    '/usr/include/wordexp.h*',
+			    '/usr/include/xlocale.h*',
+			    '/usr/include/Availability*',
+			    '/usr/include/_types.h*',
+			    '/usr/include/_wctype.h*',
+			    '/usr/include/runetype.h*',
+			    '/usr/include/_locale.h*',
+			    '/usr/include/_xlocale.h*',
+			    '/usr/include/gethostuuid.h*',
+			    ],
+			    destination_path="")
+			self.add_header_file([
+			    '/usr/include/poll.h*',
+			    '/usr/include/unistdio.h*',
+			    '/usr/include/syslog.h*',
+			    '/usr/include/_G_config.h*',
+			    ],
+			    destination_path="")
+			self.add_header_file([
+			    "/usr/include/machine/*",
+			    ],
+			    destination_path="machine",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/xlocale/*",
+			    ],
+			    destination_path="xlocale",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/i386/*",
+			    ],
+			    destination_path="i386",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/_types/*",
+			    ],
+			    destination_path="_types",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/libkern/*",
+			    ],
+			    destination_path="libkern",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/mach/*",
+			    ],
+			    destination_path="mach",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/sys/*",
+			    ],
+			    destination_path="sys",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/bits/*",
+			    ],
+			    destination_path="bits",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/gnu/*",
+			    ],
+			    destination_path="gnu",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/linux/*",
+			    ],
+			    destination_path="linux",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/asm/*",
+			    ],
+			    destination_path="asm",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/asm-generic/*",
+			    ],
+			    destination_path="asm-generic",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/netinet/*",
+			    ],
+			    destination_path="netinet",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/net/*",
+			    ],
+			    destination_path="net",
+			    recursive=True)
+			self.add_flag("link", "-B/usr/lib")
 
diff --git a/lutin/z_system/lutinSystem_MacOs_cxx.py b/lutin/z_system/lutinSystem_MacOs_cxx.py
index 6ff03f4..0ef8599 100644
--- a/lutin/z_system/lutinSystem_MacOs_cxx.py
+++ b/lutin/z_system/lutinSystem_MacOs_cxx.py
@@ -12,6 +12,7 @@ from lutin import debug
 from lutin import system
 from lutin import tools
 from lutin import env
+from lutin import multiprocess
 import os
 
 class System(system.System):
@@ -22,8 +23,24 @@ class System(system.System):
 		self.set_valid(True)
 		# no check needed ==> just add this:
 		self.add_depend("c")
-		self.add_flag("c++","-D__STDCPP_LLVM__")
-		self.add_flag("c++-remove","-nostdlib")
-		self.add_flag("need-libstdc++", True)
+		self.add_flag("c++", "-D__STDCPP_LLVM__")
+		if env.get_isolate_system() == False:
+			self.add_flag("c++-remove", "-nostdlib")
+			self.add_flag("need-libstdc++", True)
+		else:
+			self.add_flag("link-lib", "stdc++")
+			compilator_gcc = "g++"
+			if target.config["compilator-version"] != "":
+				compilator_gcc = compilator_gcc + "-" + target.config["compilator-version"]
+			
+			#get g++ compilation version :
+			version_cpp = multiprocess.run_command_direct(compilator_gcc + " -dumpversion");
+			if version_cpp == False:
+				debug.error("Can not get the g++ version ...")
+			
+			self.add_header_file([
+			    "/usr/include/c++/" + version_cpp + "/*"
+			    ],
+			    recursive=True)
 
 
diff --git a/lutin/z_system/lutinSystem_MacOs_m.py b/lutin/z_system/lutinSystem_MacOs_m.py
index d6319a0..2a10f34 100644
--- a/lutin/z_system/lutinSystem_MacOs_m.py
+++ b/lutin/z_system/lutinSystem_MacOs_m.py
@@ -23,5 +23,14 @@ class System(system.System):
 		self.set_valid(True)
 		# todo : create a searcher of the presence of the library:
 		self.add_flag("link-lib", "m")
+		self.add_depend([
+		    'c'
+		    ])
+		if env.get_isolate_system() == True:
+			self.add_header_file([
+			    "/usr/include/math.h"
+			    ],
+			    clip_path="/usr/include",
+			    recursive=False)
 
 
diff --git a/lutin/z_system/lutinSystem_MacOs_pthread.py b/lutin/z_system/lutinSystem_MacOs_pthread.py
index 308bea0..f92b048 100644
--- a/lutin/z_system/lutinSystem_MacOs_pthread.py
+++ b/lutin/z_system/lutinSystem_MacOs_pthread.py
@@ -31,14 +31,22 @@ class System(system.System):
 		self.add_depend([
 		    'c'
 		    ])
-		"""
 		if env.get_isolate_system() == True:
 			self.add_header_file([
 			    "/usr/include/sched.h",
 			    "/usr/include/pthread.h"
 			    ],
 			    clip_path="/usr/include/")
-		"""
+			self.add_header_file([
+			    "/usr/include/pthread/*",
+			    ],
+			    destination_path="pthread",
+			    recursive=True)
+			self.add_header_file([
+			    "/usr/include/pthread/*",
+			    ],
+			    destination_path="",
+			    recursive=True)
 	
 
 
diff --git a/lutin/z_target/lutinTarget_MacOs.py b/lutin/z_target/lutinTarget_MacOs.py
index 4f5a7ed..88ff3d1 100644
--- a/lutin/z_target/lutinTarget_MacOs.py
+++ b/lutin/z_target/lutinTarget_MacOs.py
@@ -14,6 +14,7 @@ from lutin import tools
 from lutin import host
 from lutin import multiprocess
 from lutin import depend
+from lutin import env
 import os
 import stat
 import shutil
@@ -48,6 +49,8 @@ class Target(target.Target):
 		self.pkg_path_bin = "MacOS"
 		self.pkg_path_lib = "lib"
 		self.pkg_path_license = "license"
+		if env.get_isolate_system() == True:
+			self.sysroot = "--sysroot=/aDirectoryThatDoesNotExist/"
 		
 		self.add_flag("link-lib", [
 		    "dl"