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diff --git a/gmp/mpq/cmp_si.c b/gmp/mpq/cmp_si.c
new file mode 100644
index 00000000..a744a984
--- /dev/null
+++ b/gmp/mpq/cmp_si.c
@@ -0,0 +1,56 @@
+/* _mpq_cmp_si -- compare mpq and long/ulong fraction.
+
+Copyright 2001 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"
+
+
+/* Something like mpq_cmpabs_ui would be more useful for the neg/neg case,
+   and perhaps a version accepting a parameter to reverse the test, to make
+   it a tail call here.  */
+
+int
+_mpq_cmp_si (mpq_srcptr q, long n, unsigned long d)
+{
+  /* need canonical sign to get right result */
+  ASSERT (q->_mp_den._mp_size > 0);
+
+  if (q->_mp_num._mp_size >= 0)
+    {
+      if (n >= 0)
+        return _mpq_cmp_ui (q, n, d);            /* >=0 cmp >=0 */
+      else
+        return 1;                                /* >=0 cmp <0 */
+    }
+  else
+    {
+      if (n >= 0)
+        return -1;                               /* <0 cmp >=0 */
+      else
+        {
+          mpq_t  qabs;
+          qabs->_mp_num._mp_size = ABS (q->_mp_num._mp_size);
+          qabs->_mp_num._mp_d    = q->_mp_num._mp_d;
+          qabs->_mp_den._mp_size = q->_mp_den._mp_size;
+          qabs->_mp_den._mp_d    = q->_mp_den._mp_d;
+
+          return - _mpq_cmp_ui (qabs, -n, d);    /* <0 cmp <0 */
+        }
+    }
+}