diff --git a/Makefile.am b/Makefile.am
index 1df2919..8f5df07 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -63,8 +63,11 @@ CLEANFILES =
 
 ACLOCAL_AMFLAGS = -I m4
 
-install_macros = m4/sgpemv2-dirs.m4
-macros = m4/compilerflags.m4 \
+install_macros = \
+	m4/sgpemv2-dirs.m4 \
+	m4/sgpemv2-visibility.m4
+macros = \
+	m4/compilerflags.m4 \
 	m4/linkingflags.m4
 
 EXTRA_DIST += \
diff --git a/configure.ac b/configure.ac
index cfcf1df..467e248 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,53 +94,7 @@ PKG_CHECK_MODULES([GTKMM],
 		:, AC_MSG_ERROR([$GTKMM_PKG_ERRORS]))
 
 dnl use DSO visibility tags for systems that supports it correctly
-dnl (for example, GCC 4.0 and above)
-dnl see http://gcc.gnu.org/wiki/Visibility for more informations
-AH_TEMPLATE([SG_DLLEXPORT],[Attribute for objects to be exported from DSOs])
-AH_TEMPLATE([SG_DLLIMPORT],[Attribute for objects to be imported from DSOs])
-AH_TEMPLATE([SG_DLLLOCAL], [Attribute for objects local to current DSO])
-AH_TEMPLATE([SG_DLLPUBLIC],[Attribute for DSO public objects])
-
-AC_ARG_ENABLE([visibility-support],
-    AS_HELP_STRING([--disable-visibility-support],
-                   [disable the new GCC visibility support]),
-    [enable_gcc_visibility="$enableval"],
-		[enable_gcc_visibility="yes"])
-AC_MSG_CHECKING([whether to use new GCC visibility attributes])
-
-dnl for now it works only with GCC >= 4.0.0
-AC_LANG_PUSH([C++])
-if test "x$enable_gcc_visibility" = "xyes"; then
-	 AC_COMPILE_IFELSE(
-	 	AC_LANG_PROGRAM([], [
-				#if defined __GNUC__ && (__GNUC__) >= 4
-						return 0;
-				#else
-						bails out with a compilation error.
-    		#endif
-    ]),
-		:,
-		[enable_gcc_visibility="no"])
-fi
-AC_LANG_POP				
-
-if test "x$enable_gcc_visibility" = "xyes"; then
-	  AC_MSG_RESULT([yes])
-		AC_DEFINE([SG_DLLIMPORT],[/* intentionally left with no value */])
-		AC_DEFINE([SG_DLLEXPORT],[__attribute__ ((visibility("default")))])
-		AC_DEFINE([SG_DLLLOCAL],[__attribute__ ((visibility("hidden")))])
-		AC_DEFINE([SG_DLLPUBLIC],[__attribute__ ((visibility("default")))])
-
-		AC_CHECK_CXXFLAG([VISIB_HIDDEN], [fvisibility=hidden])
-		AC_SUBST([VISIB_HIDDEN])
-		AC_CHECK_CXXFLAG([CXXFLAGS],[fvisibility-inlines-hidden])
-else
-		AC_MSG_RESULT([no])
-		AC_DEFINE([SG_DLLIMPORT],[/* unsupported */])
-		AC_DEFINE([SG_DLLEXPORT],[/* unsupported */])
-		AC_DEFINE([SG_DLLLOCAL],[/* unsupported */])
-		AC_DEFINE([SG_DLLPUBLIC],[/* unsupported */])
-fi
+SGPEMV2_VISIBILITY_SUPPORT
 
 dnl check for Doxygen
 AC_CHECK_PROG([HAVE_DOXYGEN],[doxygen],[yes])
diff --git a/m4/sgpemv2-visibility.m4 b/m4/sgpemv2-visibility.m4
new file mode 100644
index 0000000..a70d256
--- /dev/null
+++ b/m4/sgpemv2-visibility.m4
@@ -0,0 +1,87 @@
+dnl m4/sgpemv2-visibility.m4 - Copyright 2005, 2006, University
+dnl                      of Padova, dept. of Pure and Applied
+dnl                      Mathematics
+dnl
+dnl This file is part of SGPEMv2.
+dnl
+dnl This is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl SGPEMv2 is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with SGPEMv2; if not, write to the Free Software
+dnl Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+dnl ---------- AC_PROG_SGPEMV2 ---------------------
+dnl
+dnl Synopsis: AC_PROG_SGPEMV2([min_version])
+dnl
+dnl This macro enables the new DSO visibility
+dnl support for compilers that supports it, defining
+dnl the following preprocessor macros:
+dnl    SG_DLLEXPORT  : for objects exported by the DSO
+dnl    SG_DLLIMPORT  : for objects imported by the DSO
+dnl    SG_DLLLOCAL   : for objects local to the DSO
+dnl    SG_DLLPUBLIC  : for objects public outside the DSO
+dnl
+dnl Example of usage: SGPEMV2_VISIBILITY_SUPPORT
+dnl ------------------------------------------------
+AC_DEFUN([SGPEMV2_VISIBILITY_SUPPORT],
+[ 
+
+dnl use DSO visibility tags for systems that supports it correctly
+dnl (for example, GCC 4.0 and above)
+dnl see http://gcc.gnu.org/wiki/Visibility for more informations
+AH_TEMPLATE([SG_DLLEXPORT],[Attribute for objects to be exported from DSOs])
+AH_TEMPLATE([SG_DLLIMPORT],[Attribute for objects to be imported from DSOs])
+AH_TEMPLATE([SG_DLLLOCAL], [Attribute for objects local to current DSO])
+AH_TEMPLATE([SG_DLLPUBLIC],[Attribute for DSO public objects])
+
+AC_ARG_ENABLE([visibility-support],
+    AS_HELP_STRING([--disable-visibility-support],
+                   [disable the new GCC visibility support]),
+    [enable_gcc_visibility="$enableval"],
+		[enable_gcc_visibility="yes"])
+AC_MSG_CHECKING([whether to use new GCC visibility attributes])
+
+dnl for now it works only with GCC >= 4.0.0
+AC_LANG_PUSH([C++])
+if test "x$enable_gcc_visibility" = "xyes"; then
+	 AC_COMPILE_IFELSE(
+	 	AC_LANG_PROGRAM([], [
+				#if defined __GNUC__ && (__GNUC__) >= 4
+						return 0;
+				#else
+						bails out with a compilation error.
+    		#endif
+    ]),
+		:,
+		[enable_gcc_visibility="no"])
+fi
+AC_LANG_POP				
+
+if test "x$enable_gcc_visibility" = "xyes"; then
+	  AC_MSG_RESULT([yes])
+		AC_DEFINE([SG_DLLIMPORT],[/* intentionally left with no value */])
+		AC_DEFINE([SG_DLLEXPORT],[__attribute__ ((visibility("default")))])
+		AC_DEFINE([SG_DLLLOCAL],[__attribute__ ((visibility("hidden")))])
+		AC_DEFINE([SG_DLLPUBLIC],[__attribute__ ((visibility("default")))])
+
+		AC_CHECK_CXXFLAG([VISIB_HIDDEN], [fvisibility=hidden])
+		AC_SUBST([VISIB_HIDDEN])
+		AC_CHECK_CXXFLAG([CXXFLAGS],[fvisibility-inlines-hidden])
+else
+		AC_MSG_RESULT([no])
+		AC_DEFINE([SG_DLLIMPORT],[/* unsupported */])
+		AC_DEFINE([SG_DLLEXPORT],[/* unsupported */])
+		AC_DEFINE([SG_DLLLOCAL],[/* unsupported */])
+		AC_DEFINE([SG_DLLPUBLIC],[/* unsupported */])
+fi
+
+])dnl ------- SGPEMV2_VISIBILITY_SUPPORT ---------------------
\ No newline at end of file
diff --git a/src/backend/concrete_environment.cc b/src/backend/concrete_environment.cc
index fa0ee6c..1d67fac 100644
--- a/src/backend/concrete_environment.cc
+++ b/src/backend/concrete_environment.cc
@@ -136,6 +136,7 @@ ConcreteEnvironment::get_request_queue(resource_key_t resource_key) const
 				}
 		}
 
+
   return request_queue;
 }
 
@@ -171,11 +172,3 @@ ConcreteEnvironment::~ConcreteEnvironment()
   // After that, the destructor of _processes is invoked (only invalid pointers)
   // After that, the destructor of _resources is invoked (only invalid pointers)
 }
-
-
-
-void
-ConcreteEnvironment::serialize(SerializeVisitor& translator) const
-{
-  // TODO: call something like translator.serializeEnvironment(this);
-}
diff --git a/src/backend/concrete_environment.hh b/src/backend/concrete_environment.hh
index cbae9c6..c92d0e6 100644
--- a/src/backend/concrete_environment.hh
+++ b/src/backend/concrete_environment.hh
@@ -155,12 +155,6 @@ namespace sgpem
 			~ConcreteEnvironment();
 
 
-
-    /// \brief Serializes the whole environment.
-    /// \see SerializeVisitor
-    virtual void
-			serialize(SerializeVisitor& translator) const;
-
   private:
     /// \brief The container of all Resource objecs.
     /// Actually contains only DynamicResource objects.