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diff --git a/third_party/libtiff/tiffconf.h b/third_party/libtiff/tiffconf.h
index 2a88cb75f..4d2d7c9d9 100644
--- a/third_party/libtiff/tiffconf.h
+++ b/third_party/libtiff/tiffconf.h
@@ -35,17 +35,26 @@
#define HAVE_SEARCH_H 1
#endif
-static const size_t sizeOfInt = sizeof(int);
-/* The size of a `int', as computed by sizeof. */
-#define SIZEOF_INT sizeOfInt
-
-static const size_t sizeOfULong = sizeof(unsigned long);
+/* The size of a `int'. */
+/* According typedef int int32_t; in the fx_system.h*/
+#define SIZEOF_INT 4
+
+/* Sunliang.Liu 20110325. We should config the correct long size for tif
+ fax4decode optimize in tif_fax3.c -- Linux64 decode issue.
+ TESTDOC: Bug #23661 - z1.tif. */
+#if _FX_CPU_ == _FX_X64_ || _FX_CPU_ == _FX_IA64_
/* The size of `unsigned long', as computed by sizeof. */
-#define SIZEOF_UNSIGNED_LONG sizeOfULong
+#define SIZEOF_UNSIGNED_LONG 8
+#else
+#define SIZEOF_UNSIGNED_LONG 4
+#endif
-static const size_t sizeOfVoidP = sizeof(void*);
-/* The size of void* as computed by sizeof. */
-#define SIZEOF_VOIDP sizeOfVoidP
+/* The size of void*. */
+#ifdef __LP64__
+#define SIZEOF_VOIDP 8
+#else
+#define SIZEOF_VOIDP 4
+#endif
/* Signed 8-bit type */
#define TIFF_INT8_T signed char