Seems I can't "unforget" erroneously forgotten files, so will have to forget them and then re-add them
// (C) Copyright John Maddock 2001 - 2002.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for most recent version.
#if __IBMCPP__ <= 501
# define BOOST_NO_STD_ALLOCATOR
#endif
#define BOOST_HAS_MACRO_USE_FACET
#define BOOST_NO_STD_MESSAGES
#define BOOST_NO_STD_UNORDERED
#define BOOST_STDLIB "Visual Age default standard library"