libcgi库安装

 官网：https://boutell.com/cgic/#build

1. 可直接tar包安装

tar xvf libcgi-1.0.tar.gz
cd libcgi-1.0
./configure
make
cd src

sudo cp libcgi.so /usr/lib
sudo cp cgi.h session.h /usr/include

写代码时包含头文件应写：
#include <cgi.h>
#include <session.h>

学习libcgi库的方法：
源码包目录/doc/html目录下有一个index.html是帮助文档。
源码包目录/examples目录下是各种示例程序，结合帮助文档研究它们是如何工作的。

2. apt-get源上安装
sudo apt-get install libcgic-dev

注：apt-get安装软件时下载的包存放在目录：/var/cache/apt/archives
包含头文件需要写：
#include <cgic.h>

在libcgic 2.0+，主程序主要实现cgiMain()函数。

一般编译命令：gcc cgictest.c -lcgic

注：通过dpgk -c libcgic-dev_2.05-3_i386.deb可查看文件安装目录

~$dpkg  -c libcgic-dev_2.05-3_i386.deb 
drwxr-xr-x root/root         0 2012-05-24 23:13 ./
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/share/
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/share/doc/
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/share/doc/libcgic-dev/
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/share/doc/libcgic-dev/examples/
-rw-r--r-- root/root      4299 2004-04-23 04:49 ./usr/share/doc/libcgic-dev/examples/cgictest.c.gz
-rw-r--r-- root/root       338 2004-04-23 04:49 ./usr/share/doc/libcgic-dev/examples/capture.c
-rw-r--r-- root/root    105885 2004-11-16 00:59 ./usr/share/doc/libcgic-dev/cgic.html
-rw-r--r-- root/root       990 2012-05-24 23:13 ./usr/share/doc/libcgic-dev/copyright
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/lib/
-rw-r--r-- root/root     29364 2012-05-24 23:13 ./usr/lib/libcgic.a
drwxr-xr-x root/root         0 2012-05-24 23:13 ./usr/include/
-rw-r--r-- root/root      7403 2004-04-23 04:49 ./usr/include/cgic.h
lrwxrwxrwx root/root         0 2012-05-24 23:13 ./usr/share/doc/libcgic-dev/changelog.Debian.gz -> ../libcgic2/changelog.Debian.gz
lrwxrwxrwx root/root         0 2012-05-24 23:13 ./usr/lib/libcgic.so -> libcgic.so.2.05

3. 安装目录下capture.c为标准范例

#include "cgic.h"                                                               

int cgiMain() {
    cgiWriteEnvironment("/CHANGE/THIS/PATH/capcgi.dat");
    cgiHeaderContentType("text/html");
    fprintf(cgiOut, "<title>Captured</title>
");
    fprintf(cgiOut, "<h1>Captured</h1>
");
    fprintf(cgiOut, "Your form submission was captured for use in
");
    fprintf(cgiOut, "debugging CGI code.
");
    return 0;
}

参考：

1. http://webjs.blog.sohu.com/301265970.html