1 ./configure # try to figure out all implementation differences
2 cd lib # build the basic library that all programs need
3 make # use "gmake" everywhere on BSD/OS systems
4 cd ../libfree # continue building the basic library
5 make
6 cd ../libroute # only if your system supports 4.4BSD style routing sockets
7 make # only if your system supports 4.4BSD style routing sockets
8 cd ../libxti # only if your system supports XTI
9 make # only if your system supports XTI
10 cd ../intro # build and test a basic client program
11 make daytimetcpcli
12 ./daytimetcpcli 127.0.0.1
ubuntu只执行1，2，3，4，5，测试（10，11，12 ）
执行完前五步，测试还不能通过。
lin@lin-X555LI:~/Downloads/unix-network-programing/unpv13e/intro$ ./daytimetcpcli 127.0.0.1
connect error: Connection refused需要 启动 datetime 服务
sudo apt-get install xinetd
sudo vi /etc/xinetd.d/daytime 将disable =yes改为no
然后重启并运行程序即可看到结果：
/etc/init.d/xinetd restart
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service xinetd restart
顺利到这，测试可以通过了:
lin@lin:~/Downloads/unix-network-programing/unpv13e/intro$ ./daytimetcpcli 127.0.0.1
27 APR 2017 23:20:36 CST