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\section{Built-in Module \sectcode{mpz}}
\bimodindex{mpz}
-This module implements the interface to part of the GNU MP library.
-This library contains arbitrary precision integer and rational number
-arithmetic routines. Only the interfaces to the \emph{integer}
+This is an optional module. It is only available when Python is
+configured to include it, which requires that the GNU MP software is
+installed.
+
+This module implements the interface to part of the GNU MP library,
+which defines arbitrary precision integer and rational number
+arithmetic routines. Only the interfaces to the \emph{integer}
(\samp{mpz_{\rm \ldots}}) routines are provided. If not stated
otherwise, the description in the GNU MP documentation can be applied.