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diff --git a/gmp/mpz/fits_s.h b/gmp/mpz/fits_s.h
new file mode 100644
index 00000000..a91e8218
--- /dev/null
+++ b/gmp/mpz/fits_s.h
@@ -0,0 +1,50 @@
+/* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
+
+Copyright 1997, 2000, 2001, 2002 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+int
+FUNCTION (mpz_srcptr z)
+{
+  mp_size_t n = SIZ(z);
+  mp_ptr p = PTR(z);
+  mp_limb_t limb = p[0];
+
+  if (n == 0)
+    return 1;
+  if (n == 1)
+    return limb <= MAXIMUM;
+  if (n == -1)
+    return limb <= - (mp_limb_t) MINIMUM;
+#if GMP_NAIL_BITS != 0
+  {
+    if ((p[1] >> GMP_NAIL_BITS) == 0)
+      {
+	limb += p[1] << GMP_NUMB_BITS;
+	if (n == 2)
+	  return limb <= MAXIMUM;
+	if (n == -2)
+	  return limb <= - (mp_limb_t) MINIMUM;
+      }
+  }
+#endif
+  return 0;
+}