由于本机是64bit机器编译出差，解决办法： size改为socklen_t
PS：出错信息如下：
23:16:53 **** Build of configuration Default for project unpv13e ****
make all 
gcc -I../lib -g -O2 -D_REENTRANT -Wall   -c -o in_cksum.o in_cksum.c
gcc -I../lib -g -O2 -D_REENTRANT -Wall   -c -o inet_ntop.o inet_ntop.c
inet_ntop.c: In function ‘inet_ntop’:
inet_ntop.c:60:9: error: argument ‘size’ doesn’t match prototype
In file included from inet_ntop.c:27:0:
/usr/include/arpa/inet.h:65:22: error: prototype declaration
make: *** [inet_ntop.o] Error 1

23:16:53 Build Finished (took 228ms)