Hello boost developers, this is my first mail to boost@lists.boost.org and it is already a bug that I found in the latest release 1.31.0 :-( I tried to compile boost::math::asinh, boost::math::acosh and boost::math::atanh recently and got a compile error "C2039 'abs' : is not a member of '_STL'" on my MSVC6 compiler. I have STLPort 4.5.3 installed and thought, this might be the problem, but then I found out that boost::math::sinc_pi and boost::math::sinhc_pi compile with no errors. To make it short: asinh, acosh and atanh are using ::std::abs, ::std::sqrt and ::std::log - which are not part of the STL. To fix this problem, I have created a patch - see attached files. Best regards, Carsten Huber ------------------------------------------------- Dipl.-Ing. Carsten Huber (Member of the VDE) Software Development Engineer Product Line Diagnostics (PDG) Vector Informatik GmbH Ingersheimer Str. 24 D-70499 Stuttgart Phone : +49 711 80670-0 Fax : +49 711 80670-299 Mailto : carsten.huber@vector-informatik.de Internet: http://www.vector-informatik.de -------------------------------------------------