http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51486
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-09 16:47:48 UTC --- With the difference vs tr1, that in this case, as far as I can see, there are no name collision issues, thus installing both decimal and decimal.h at the the same level of the the other standard headers would be trivial, if we wanted.