查看readme文件：
Execute the following from the src/ directory:
./configure # try to figure out all implementation differences
cd lib # build the basic library that all programs need
make # use "gmake" everywhere on BSD/OS systems
cd ../libfree # continue building the basic library
make
cd ../libroute # only if your system supports 4.4BSD style routing sockets
make # only if your system supports 4.4BSD style routing sockets
cd ../libxti # only if your system supports XTI
make # only if your system supports XTI
cd ../intro # build and test a basic client program
make daytimetcpcli
./daytimetcpcli 127.0.0.1[email protected]:~/Projects/unixNetwork/lib$ cd ../libfree
[email protected]:~/Projects/unixNetwork/libfree$ make
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
size_t size;
^~~~
In file included from inet_ntop.c:27:0:
/usr/include/arpa/inet.h:64:20: error: prototype declaration
extern const char *inet_ntop (int __af, const void *__restrict __cp,
^~~~~~~~~
<builtin>: recipe for target ‘inet_ntop.o‘ failed
make: *** [inet_ntop.o] Error 1
[email protected]:~/Projects/unixNetwork/libfree$ vim inet_ntop.c
--〉将第60行的 size_t size 改成 socklen_t size; 再次make，有警告，但是可以忽略。將文件拷貝到指定的目錄：
[email protected]:~/Projects/unixNetwork$ sudo cp libunp.a /usr/lib
[email protected]:~/Projects/unixNetwork$ sudo cp lib/unp.h /usr/include
[email protected]:~/Projects/unixNetwork$ sudo cp config.h /usr/include
[email protected]:~/Projects/unixNetwork$ vim lib/unp.h # 将#include "../config.h" 改成 #include "config.h"對代碼進行編譯：
[email protected]:~/Projects/unixNetwork/intro$ gcc daytimetcpcli.c -o cli -lunp
[email protected]:~/Projects/unixNetwork/intro$ gcc daytimetcpsrv.c -o srv -lunp運行第一個例子：
[email protected]:~/Projects/unixNetwork/intro$ sudo ./srv
[email protected]:~/Projects/unixNetwork/intro$ ./cli 127.0.0.1
Fri Feb 9 20:09:46 2018
[email protected]:~/Projects/unixNetwork/intro$ ./cli 127.0.0.1
Fri Feb 9 20:09:47 2018