extern void *xrealloc (void *, size_t);
extern char *xstrdup (const char *);
extern void xnomem (void);
+extern void free (void *);
# define xmalloc(size) (XMALLOC_TRACE (xmalloc) ((size)))
# define xrealloc(ptr, size) (XMALLOC_TRACE (xrealloc) ((ptr), (size)))