Fix bug for Boost 1.52.0 (see Boost ticket #7671 https://svn.boost.org/trac/boost/ticket/7671)
Fix bug for Boost 1.52.0 (see Boost ticket #7671 https://svn.boost.org/trac/boost/ticket/7671)

esteve/r2d2-nxt,esteve/r2d2-nxt