Sparc memory manipulation functions in 2.4.18

While trying to compile user-mode-linux-2.4.18-22 on Ultra Sparc using gcc-3.2, I get undefined references to __builtin_memcpy, __builtin_memset, __memcpy, __memset. I guess implementations to those functions should be provided by gcc itself. Any ideas on what might be wrong here?

-Shanti