求助编写 socket tcp程序时出现错误！清大家帮忙！

小弟，按照网上帖子写了一个 client.c 和 server.c ，可是进行编译时无法通过，提示如下错误：小弟也将源文件上传上来了，希望大家多多帮忙，谢谢！
neusoft@neusoft-desktop:~/del$ vi server.c
neusoft@neusoft-desktop:~/del$ gcc -o server server.c
server.c:6:18: error: arpa.h: 没有该文件或目录
server.c: In function ‘main’:
server.c:48: error: ‘temp_sock_discriptor’ undeclared (first use in this function)
server.c:48: error: (Each undeclared identifier is reported only once
server.c:48: error: for each function it appears in.)
server.c:57: error: incompatible types in assignment
neusoft@neusoft-desktop:~/del$ ls
client.c Makefile server.c socket_test wr
neusoft@neusoft-desktop:~/del$ gcc -o client client.c
client.c: In function ‘main’:
client.c:23: error: subscripted value is neither array nor pointer
client.c:32: warning: incompatible implicit declaration of built-in function ‘bzero’
client.c:32: error: ‘pin’ undeclared (first use in this function)
client.c:32: error: (Each undeclared identifier is reported only once
client.c:32: error: for each function it appears in.)
client.c:48: warning: incompatible implicit declaration of built-in function ‘strlen’
client.c:12: warning: return type of ‘main’ is not ‘int’