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diff --git a/rts/gmp/mpz/set_q.c b/rts/gmp/mpz/set_q.c
new file mode 100644
index 0000000..72d3222
--- /dev/null
+++ b/rts/gmp/mpz/set_q.c
@@ -0,0 +1,36 @@
+/* mpz_set_q (dest_integer, src_rational) -- Assign DEST_INTEGER from
+   SRC_rational.
+
+Copyright (C) 1996 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpz_set_q (mpz_ptr w, mpq_srcptr u)
+#else
+mpz_set_q (w, u)
+     mpz_ptr w;
+     mpq_srcptr u;
+#endif
+{
+  mpz_tdiv_q (w, mpq_numref (u), mpq_denref (u));
+}