Hello,
 
What is the policy by which BOOST_HAS_THREADS gets defined
or not? I used to think this macro is somehow affected by the
selection of a single-threaded or multithreaded runtime library
as done in bjam with threading=single and threading=multi, but
some experiments in Linux suggest that this is not the case,
as discussed in the following thread:
 
http://lists.boost.org/boost-build/2008/11/20641.php
 
Thank you,
 
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo