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diff --git a/ghc/runtime/gmp/move.c b/ghc/runtime/gmp/move.c
new file mode 100644
index 0000000..82b9cc3
--- /dev/null
+++ b/ghc/runtime/gmp/move.c
@@ -0,0 +1,45 @@
+/* move -- BSD compatible assignment.
+
+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 "mp.h"
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#ifdef __STDC__
+move (const MINT *u, MINT *w)
+#else
+move (u, w)
+     const MINT *u;
+     MINT *w;
+#endif
+{
+  mp_size usize;
+  mp_size abs_usize;
+
+  usize = u->size;
+  abs_usize = ABS (usize);
+
+  if (w->alloc < abs_usize)
+    _mpz_realloc (w, abs_usize);
+
+  w->size = usize;
+  MPN_COPY (w->d, u->d, abs_usize);
+}