diff --git a/src/bin/Makefile.am b/src/bin/Makefile.am
index 686d4f629..e7ec7b527 100644
--- a/src/bin/Makefile.am
+++ b/src/bin/Makefile.am
@@ -27,13 +27,14 @@ AM_CXXFLAGS = $(WARNING_CXXFLAGS)
 LDADD = libcommon.a $(top_builddir)/lib/libgnu.a ../libspot.la
 
 noinst_LIBRARIES = libcommon.a
-libcommon_a_SOURCES = 				\
-  common_output.cc 				\
-  common_output.hh 				\
+libcommon_a_SOURCES =				\
+  common_output.cc				\
+  common_output.hh				\
   common_range.cc				\
-  common_range.hh 				\
+  common_range.hh				\
   common_r.cc					\
-  common_r.hh
+  common_r.hh					\
+  common_sys.hh
 
 bin_PROGRAMS = ltlfilt genltl randltl
 ltlfilt_SOURCES = ltlfilt.cc
diff --git a/src/bin/common_output.hh b/src/bin/common_output.hh
index bfe76b017..e6e0766f4 100644
--- a/src/bin/common_output.hh
+++ b/src/bin/common_output.hh
@@ -22,9 +22,7 @@
 #ifndef SPOT_BIN_COMMON_OUTPUT_HH
 #define SPOT_BIN_COMMON_OUTPUT_HH
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "common_sys.hh"
 
 #include <argp.h>
 #include "ltlast/formula.hh"
diff --git a/src/bin/common_r.cc b/src/bin/common_r.cc
index 9a6b78ff2..e6468728e 100644
--- a/src/bin/common_r.cc
+++ b/src/bin/common_r.cc
@@ -19,12 +19,8 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
+#include "common_sys.hh"
 #include "error.h"
-
 #include "common_r.hh"
 
 int simplification_level = 0;
diff --git a/src/bin/common_range.cc b/src/bin/common_range.cc
index 052346097..fc5efa648 100644
--- a/src/bin/common_range.cc
+++ b/src/bin/common_range.cc
@@ -19,10 +19,7 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
+#include "common_sys.hh"
 #include "error.h"
 
 #include "common_range.hh"
diff --git a/src/bin/common_sys.hh b/src/bin/common_sys.hh
new file mode 100644
index 000000000..b7c9a5785
--- /dev/null
+++ b/src/bin/common_sys.hh
@@ -0,0 +1,29 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2012 Laboratoire de Recherche et Développement de
+// l'Epita (LRDE).
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// Spot is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+// License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#ifndef SPOT_BIN_COMMON_SYS_HH
+#define SPOT_BIN_COMMON_SYS_HH
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#endif // SPOT_BIN_COMMON_SYS_HH
diff --git a/src/bin/genltl.cc b/src/bin/genltl.cc
index 4b912cb19..e11099ed3 100644
--- a/src/bin/genltl.cc
+++ b/src/bin/genltl.cc
@@ -68,9 +68,7 @@
 //   publisher = {Springer-Verlag}
 // }
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "common_sys.hh"
 
 #include <iostream>
 #include <fstream>
diff --git a/src/bin/ltlfilt.cc b/src/bin/ltlfilt.cc
index 742c36b7e..7cd6e88e2 100644
--- a/src/bin/ltlfilt.cc
+++ b/src/bin/ltlfilt.cc
@@ -19,9 +19,7 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "common_sys.hh"
 
 #include <cstdlib>
 #include <vector>
diff --git a/src/bin/randltl.cc b/src/bin/randltl.cc
index 71596bce5..7aa9b1e78 100644
--- a/src/bin/randltl.cc
+++ b/src/bin/randltl.cc
@@ -19,9 +19,7 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "common_sys.hh"
 
 #include <iostream>
 #include <fstream>