--- /dev/null
+#undef PARAMS
+#if defined (__STDC__) && __STDC__
+# define PARAMS(Args) Args
+#else
+# define PARAMS(Args) ()
+#endif
+
+/* Exit value when the requested amount of memory is not available.
+ The caller may set it to some other value. */
+extern int xalloc_exit_failure;
+
+/* FIXME: describe */
+extern char *const xalloc_msg_memory_exhausted;
+
+/* FIXME: describe */
+extern void (*xalloc_fail_func) ();
+
+void *xmalloc PARAMS ((size_t n));
+void *xcalloc PARAMS ((size_t n, size_t s));
+void *xrealloc PARAMS ((void *p, size_t n));