From: moshier AT mediaone DOT net ()
Subject: Re: high precision nonlinear math functions ?
Newsgroups: comp.os.msdos.djgpp
References: <Pine DOT SUN DOT 3 DOT 91 DOT 981115130608 DOT 1381G-100000 AT is> <4 DOT 1 DOT 19981116091759 DOT 00abe6f0 AT hal DOT nt DOT tuwien DOT ac DOT at>
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Date: Tue, 17 Nov 1998 14:10:53 GMT
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To: djgpp AT delorie DOT com
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Anton Helm (tony AT dictator DOT nt DOT tuwien DOT ac DOT at) wrote:
: Numeric precision still _IS_ a problem as I use these algorithms
: on several unix hosts (where there are such functions in long double) 
: with much better results.

You could try this portable C library:
  http://www.netlib.org/cephes/ldouble.shar