+#define SECOND_LOWEST_BYTES {0xfe,0xff,0xff,0xff, 0xff,0xff,0xef,0xff}
+#endif
+
+/* "Second-lowest value" for a double. */
+#if __GNUC__
+#define second_lowest_value \
+ (__extension__ ((union cvt_dbl) {SECOND_LOWEST_BYTES}).cvt_dbl_d)
+#else /* not GNU C */
+extern union cvt_dbl second_lowest_value_union;
+#define second_lowest_value (second_lowest_value_union.cvt_dbl_d)