In fact i didn't declare tgamma_delta_ratio because it is called by the inverse_students_t_tail_series()  function.
I did include <boost/math/distributions/students_t.hpp> header though but i still have the error.

daniel

> From: boost.regex@virgin.net
> To: boost-build@lists.boost.org
> Date: Wed, 25 Aug 2010 09:22:33 +0100
> Subject: Re: [Boost-build] Boost.build : Linking problem when using inverse_students_t_tail_series() in vc++
>
> >and i'm having these linking error:
>
> Error 2 error LNK2019: unresolved external symbol "double __cdecl
> boost::math::tgamma_delta_ratio<double,double,struct
> boost::math::policies::policy<struct
> boost::math::policies::default_policy,struct
> boost::math::policies::default_policy,struct
>
> I suspect you aren't including the correct headers - I'm guessing that
> tgamma_delta_ratio is forward declared but not defined - did you include
> <boost/math/distributions/students_t.hpp> or go straight to the "detail"
> header? If the latter then it's a detail for a reason :)
>
> HTH, John.
>
> _______________________________________________
> Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost-build