Julien Delacroix wrote:

Maybe it will be necessary to check aCC version and set BOOST_DISABLE_THREADS for old aCC version that do not have thread suport...

Boost did not compile under HP/UX 11.11 (PA-RISC) with aCC because only the old aCC version 3.x is shipped on PA-RISC systems. aCC 3.x is far away from the C++ standard - use instead gcc. regards, Oliver