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diff --git a/gmp/mpz/lcm.c b/gmp/mpz/lcm.c
new file mode 100644
index 00000000..22ac0417
--- /dev/null
+++ b/gmp/mpz/lcm.c
@@ -0,0 +1,82 @@
+/* mpz_lcm -- mpz/mpz least common multiple.
+
+Copyright 1996, 2000, 2001, 2005 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"
+#include "longlong.h"
+
+
+void
+mpz_lcm (mpz_ptr r, mpz_srcptr u, mpz_srcptr v)
+{
+  mpz_t g;
+  mp_size_t usize, vsize, size;
+  TMP_DECL;
+
+  usize = SIZ (u);
+  vsize = SIZ (v);
+  if (usize == 0 || vsize == 0)
+    {
+      SIZ (r) = 0;
+      return;
+    }
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  if (vsize == 1)
+    {
+      mp_limb_t  vl, gl, c;
+      mp_srcptr  up;
+      mp_ptr     rp;
+
+    one:
+      MPZ_REALLOC (r, usize+1);
+
+      up = PTR(u);
+      vl = PTR(v)[0];
+      gl = mpn_gcd_1 (up, usize, vl);
+      vl /= gl;
+
+      rp = PTR(r);
+      c = mpn_mul_1 (rp, up, usize, vl);
+      rp[usize] = c;
+      usize += (c != 0);
+      SIZ(r) = usize;
+      return;
+    }
+
+  if (usize == 1)
+    {
+      usize = vsize;
+      MPZ_SRCPTR_SWAP (u, v);
+      goto one;
+    }
+
+  TMP_MARK;
+  size = MAX (usize, vsize);
+  MPZ_TMP_INIT (g, size);
+
+  mpz_gcd (g, u, v);
+  mpz_divexact (g, u, g);
+  mpz_mul (r, g, v);
+
+  SIZ (r) = ABS (SIZ (r));	/* result always positive */
+
+  TMP_FREE;
+}