# define NULL (void *) 0
# endif
#else
-# undef size_t
-# define size_t unsigned int
-# define CHAR_BIT 8
# define PTR char *
# define CONST /* nothing */
# define PARAMS(paramlist) ()
+# ifndef size_t
+# define size_t unsigned int
+# endif
+# ifndef CHAR_BIT
+# define CHAR_BIT 8
+# endif
# ifndef NULL
# define NULL 0
# endif