Before SVN r82706 from February 2013 (git a7091d1009), Boost.Move worked perfectly for compilers that supported deleted functions without supporting rvalue references (for example, clang with libstdc++ 4.2.1 on Mac to support OS X 10.6). r82706 broke those setups as temporaries now call the deleted copy constructor instead of the move constructor. This change reverts those setups to the old behavior.