--- gvpe/src/lzf/lzf_c.c	2007/12/02 10:31:50	1.4
+++ gvpe/src/lzf/lzf_c.c	2008/08/07 16:34:21	1.5
@@ -113,8 +113,19 @@
         u8 *out_end = op + out_len;
   const u8 *ref;
 
-  unsigned int hval;
+  /* off requires a type wide enough to hold a general pointer difference.
+   * ISO C doesn't have that (size_t might not be enough and ptrdiff_t only
+   * works for differences within a single object). We also assume that no
+   * no bit pattern traps. Since the only platform that is both non-POSIX
+   * and fails to support both assumptions is windows 64 bit, we make a
+   * special workaround for it.
+   */
+#if defined (WIN32) && defined (_M_X64)
+  unsigned _int64 off; /* workaround for missing POSIX compliance */
+#else
   unsigned long off;
+#endif
+  unsigned int hval;
   int lit;
 
   if (!in_len || !out_len)