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diff --git a/ghc/runtime/gmp/mpz_set_ui.c b/ghc/runtime/gmp/mpz_set_ui.c
new file mode 100644
index 0000000..c2e06c9
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_set_ui.c
@@ -0,0 +1,42 @@
+/* mpz_set_ui(integer, val) -- Assign INTEGER with a small value VAL.
+
+Copyright (C) 1991 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#ifdef __STDC__
+mpz_set_ui (MP_INT *dest, unsigned long int val)
+#else
+mpz_set_ui (dest, val)
+     MP_INT *dest;
+     unsigned long int val;
+#endif
+{
+  /* We don't check if the allocation is enough, since the rest of the
+     package ensures it's at least 1, which is what we need here.  */
+  if (val > 0)
+    {
+      dest->d[0] = val;
+      dest->size = 1;
+    }
+  else
+    dest->size = 0;
+}