+AH_BOTTOM([/* fseeko portability defines */
+#ifdef HAVE_FSEEKO
+# define LOFF_T off_t
+# if SIZEOF_OFF_T == 8
+# define OFF_T_FMT "%lld"
+# else
+# define OFF_T_FMT "%ld"
+# endif
+#else
+# define LOFF_T long
+# define fseeko fseek
+# define ftello ftell
+# define OFF_T_FMT "%ld"
+#endif
+])