configure: require boost.thread v2

configure.in

@@ -143,6 +143,17 @@ AC_CHECK_LIB(boost_regex$BOOST_LIB_SUFFIX, main, LDFLAGS="$LDFLAGS -lboost_regex
 	AC_MSG_ERROR([no boost.regex library found])
 )
 
+dnl =============================
+dnl = checking for boost.thread =
+dnl =============================
+CPPFLAGS="$CPPFLAGS -DBOOST_THREAD_VERSION=2"
+AC_CHECK_HEADERS([boost/thread.hpp], ,
+	AC_MSG_ERROR([boost/thread.hpp is missing or your boost version is too old (boost.thread v2 is required)])
+)
+AC_CHECK_LIB(boost_thread$BOOST_LIB_SUFFIX, main, LDFLAGS="$LDFLAGS -lboost_thread$BOOST_LIB_SUFFIX",
+	AC_MSG_ERROR([no boost.thread library found])
+)
+
 dnl ==============================
 dnl = checking for regex (win32) =
 dnl ==============================