 by Dan
     Christensen.  Other <code>long double</code> routines might be desirable
     too, but <code>mpf</code> would be a start.
     <br>
     <code>long double</code> is an ANSI-ism, so everything involving it would
     need to be suppressed on a K&amp;R compiler.
     <br>
     There'd be some work to be done by <code>configure</code> to recognise
     the format in use, MPFR has a start on this.  Often <code>long
     double</code> is the same as <code>double</code>, which is easy but
     pretty