在linux（CentOS6.5）上安装Apache，要首先确保以下程序事先安装
apr：The mission of the Apache Portable Runtime (APR) project is to create and maintain
software libraries that provide a predictable and consistent interface to underlying
platform-specific implementations.The primary goal is to provide an API to which
software developers may code and be assured of predictable if not identical behaviour
regardless of the platform on which their software is built, relieving them of the need
to code special-case conditions to work around or take advantage of platform-specific
deficiencies or features.
参考：http://blog.csdn.net/jmshl/article/details/6773731
apr-util
pcre：The Perl Compatible Regular Expressions (PCRE) library is a set of functions that implement
regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE
has its own native API, in addition to a set of POSIX compatible wrapper functions.
安装步骤如下：
1、安装apr
下载：http://apr.apache.org/download.cgi
tar -zxvf apr-1.5.2.tar.gz
cd apr-1.5.2
./configure --prefix=/usr/local/apr/
make
make install
2、安装apr-util
下载：http://apr.apache.org/download.cgi
tar -zxvf apr-util-1.5.4.tar.gz
cd apr-util-1.5.4
./configure --prefix=/usr/local/apr-util/ --with-apr=/usr/local/apr/
make
make install
3、安装pcre
下载：http://sourceforge.net/projects/pcre
unzip -o pcre-8.39.zip
cd pcre-8.39
./configure --prefix=/usr/local/pcre
make
make install
4、安装apache
下载：http://httpd.apache.org/download.cgi
tar -zxvf httpd-2.4.20.tar.gz
cd httpd-2.4.20
./configure --prefix=/usr/local/apache2.4.20/ --with-apr=/usr/local/apr/ --with-apr-util=/usr/local/apr-util/ --with-pcre=/usr/local/pcre
make
make install
5、配置
vi /usr/local/apache2.4.20/conf/httpd.conf
6、启动、关闭
cd /usr/local/apache2.4.20/bin
./apachectl -k start
./apachectl -k stop
./apachectl -k restart
如果配置文件中Listen定义的是默认的80端口(或1024以下)，那么启动Apache将需要root权限以将它绑定在特权端口上。