+
+/* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */
+#ifdef realloc
+# define NEED_REALLOC_GNU 1
+#endif
+
+/* Infer the properties of the system's malloc function.
+ Only the AC_FUNC_MALLOC macro defines 'malloc' already in config.h. */
+#if GNULIB_MALLOC_GNU && !defined malloc
+# define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
+#endif
+
+/* Below we want to call the system's malloc and realloc.
+ Undefine the symbols here so that including <stdlib.h> provides a
+ declaration of malloc(), not of rpl_malloc(), and likewise for realloc. */
+#undef malloc