one missing change in trac #436: wording update to the configure error message.

quite trivial and already agreed in review, so directly committing it to trunk.


git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@3870 e5f2f494-b856-4b98-b285-d166d9295462

configure.ac

@@ -351,7 +351,8 @@ boost::mutex m;
 		    need_libboost_thread=1 ],
 		  [ AC_MSG_RESULT(no)
 		    AC_MSG_ERROR([boost::mutex cannot be linked in this build environment.
-Perhaps you are using an older version of Boost that requires libboost_thread for the mutex support.  You may want to check the availability of the library or to upgrade Boost.])
+Perhaps you are using an older version of Boost that requires libboost_thread for the mutex support, which does not appear to be available.
+You may want to check the availability of the library or to upgrade Boost.])
    		  ])])
 CPPFLAGS="$CPPFLAGS_SAVES"
 LIBS="$LIBS_SAVES"