lications using
          autoconf could probe the library too.)
     </ul>
     It'd be possible to defer the need for <code>long long</code> to
     application compile time, by having something like
     <code>mpz_set_2ui</code> called with two halves of a <code>long
     long</code>.  Disadvantages of this would be,
     <ul>
     <li> Bigger code in the application, though perhaps not if a <code>long
          long</code> is normally passed as two halves anyway.
     <li> <code>mpz_get_ull</code> would