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diff --git a/libshouldbeinlibc/lcm.c b/libshouldbeinlibc/lcm.c
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+/* Lcm (least common multiple), and gcd (greatest common divisor)
+
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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 Hurd 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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* There are probably more efficient ways to do these...  */
+
+/* Return the greatest common divisor of p & q.  */
+inline long
+gcd (long p, long q)
+{
+  if (p == 0)
+    return q;
+  else if (q == 0)
+    return p;
+  else if (p == q)
+    return p;
+  else if (q > p)
+    return gcd (q, p);
+  else
+    return gcd (q, p % q);
+}
+
+/* Return the least common multiple of p & q.  */
+long
+lcm (long p, long q)
+{
+  return (p / gcd (p, q)) * q;
+}