diff --git a/README b/README
index 97f8cc17e..0d2acb712 100644
--- a/README
+++ b/README
@@ -53,6 +53,23 @@ If you run the tests on a SunOS4.1.4 system, expect the ctime-part of
 the ls `time-1' test to fail.  I believe that is due to a bug in the
 way Sun implemented link(2) and chmod(2).
 
+A known problem exists when compiling on HPUX on both hppa and ia64
+in 64-bit mode (i.e. +DD64) on all known HPUX 11.x versions.  This
+is not due to a bug in the package but instead due to a bug in the
+system header file which breaks things in 64-bit mode.  The default
+compilation mode is 32-bit and the software compiles fine using the
+default mode.  To build this software in 64-bit mode you will need
+to fix the system /usr/include/inttypes.h header file.  After
+correcting that file the software also compiles fine in 64-bit mode.
+Here is one possible patch to correct the problem.
+
+--- /usr/include/inttypes.h.orig	Thu May 30 01:00:00 1996
++++ /usr/include/inttypes.h	Sun Mar 23 00:20:36 2003
+@@ -489 +489 @@
+-#ifndef __STDC_32_MODE__
++#ifndef __LP64__
+
+
 There are pretty many tests, but nowhere near as many as we need.
 Additions and corrections are very welcome.