zmalloc.o: In function `zmalloc_used_memory':
/root/redis-2.6.4/src/zmalloc.c:223: undefined reference to `__sync_add_and_fetch_4'
collect2: ld 返回 1
make[1]: *** [redis-server] 错误 1
make[1]: Leaving directory `/root/redis-2.6.4/src'
make: *** [all] 错误 2