diff -Naur commoncpp2-1.6.1.orig/m4/ost_pthread.m4 commoncpp2-1.6.1/m4/ost_pthread.m4
--- commoncpp2-1.6.1.orig/m4/ost_pthread.m4	2008-05-06 10:47:42.000000000 +0200
+++ commoncpp2-1.6.1/m4/ost_pthread.m4	2008-05-06 16:11:05.000000000 +0200
@@ -92,7 +92,9 @@
   dnl check for gcc's bits/atomicity and the atomic functions therein
   AC_CHECK_HEADERS([bits/atomicity.h],
 	ost_cv_bits_atomicity=yes,
-	ost_cv_bits_atomicity=no)
+	[AC_CHECK_HEADERS([ext/atomicity.h],
+		ost_cv_bits_atomicity=yes,
+		ost_cv_bits_atomicity=no)])
   if test $ost_cv_bits_atomicity = yes ; then
       AC_MSG_CHECKING([for _Atomic_word])
       AC_TRY_COMPILE([#include <bits/atomicity.h>],
@@ -103,7 +105,15 @@
 	    ],
 	    [ost_cv_gcc_atomic=yes
 	     AC_DEFINE(HAVE_GCC_BITS_ATOMIC, [1], [has gcc atomic functions])],
-	    [ost_cv_gcc_atomic=no])
+	    [AC_TRY_COMPILE([#include <ext/atomicity.h>],
+		    [
+		    _Atomic_word i = 0;
+		    __atomic_add(&i, 1);
+		    __exchange_and_add(&i, 1);
+		    ],
+		    [ost_cv_gcc_atomic=yes
+		    AC_DEFINE(HAVE_GCC_BITS_ATOMIC, [1], [has gcc atomic functions])],
+		    [ost_cv_gcc_atomic=no])])
       AC_MSG_RESULT($ost_cv_gcc_atomic)
 
       AC_MSG_CHECKING([for __gnu_cxx::_Atomic_word])
@@ -117,7 +127,17 @@
 	    [ost_cv_gcc_cxx_atomic=yes
 	     AC_DEFINE(HAVE_GCC_CXX_BITS_ATOMIC, [1], 
 		[has __gnu_cxx atomic functions])],
-	    [ost_cv_gcc_cxx_atomic=no])
+	    [AC_TRY_COMPILE([#include <ext/atomicity.h>],
+		    [
+		    using namespace __gnu_cxx;
+		    _Atomic_word i = 0;
+		    __atomic_add(&i, 1);
+		    __exchange_and_add(&i, 1);
+		    ],
+		    [ost_cv_gcc_cxx_atomic=yes
+		     AC_DEFINE(HAVE_GCC_CXX_BITS_ATOMIC, [1], 
+			[has __gnu_cxx atomic functions])],
+		    [ost_cv_gcc_cxx_atomic=no])])
       AC_MSG_RESULT($ost_cv_gcc_cxx_atomic)
   fi
 
@@ -438,7 +458,11 @@
 
 #if defined(__cplusplus)
 #if defined(HAVE_GCC_BITS_ATOMIC) || defined(HAVE_GCC_CXX_BITS_ATOMIC)
-#include <bits/atomicity.h>
+#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
+ #include <ext/atomicity.h>
+#else
+ #include <bits/atomicity.h>
+#endif
 #define HAVE_ATOMIC
 #endif
 #endif