CentOS Apache遇到的问题：APR not found
#./configure --prefix……检查编辑环境时出现：checking for APR... no
configure: error: APR not found .Please read the documentation.
可以用./configure –help | grep apr 查看帮助。
--with-included-apr Use bundled copies of APR/APR-Util
--with-apr=PATH prefix for installed APR or the full path to apr-config
--with-apr-util=PATH prefix for installed APU or the full path to
安装APR(Apache Portable Runtime )
下载：http://apr.apache.org/download.cgi
#cd /tmp/52lamp/ //源码存放位置
#tar -zxvf apr-1.4.2.tar.gz //unzip -o apr-1.4.2.zip
#cd apr-1.4.2
#./configure
#make
#make install
再次检查编译环境出现
checking for APR-util... no
configure: error: APR-util not found .Please read the documentation.
#./configure –help | grep apr-util
--with-apr-util=PATH prefix for installed APU or the full path to
下载：http://download.chinaunix.net/download/0001000/472.shtml
#tar -zxvf apr-util-1.3.9.tar.gz
#cd apr-util-1.3.9
#./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
#make
#make install
./configure仍提示APR-util not found，增加--with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util后出现
configure: error: pcre-config for libpcre not found. PCRE is required and available from http://pcre.org/
#./configure –help | grep pcre
--with-pcre=PATH Use external PCRE library
下载：http://sourceforge.net/projects/pcre
#unzip -o pcre-8.10.zip
#cd pcre-8.10
#./configure --prefix=/usr/local/pcre
#make
#make install
继续安装Apache/httpd，./configure 时加上参数 --with-apr=/usr/local/apr/ --with-apr-util=/usr/local/apr-util/ --with-pcre=/usr/local/pcre，这个问题就解决了
注意：Apache在安装时不会检查参数是否正确，错误的参数会直接被丢弃，不会报告给用户。但可以使用echo $?命令检查是否有错误，当输出结果为0时表示没有错误。
#echo $?
0
#make
#make install
复制Apache启动文件
#cp /usr/local/httpd/bin/apachectl /sbin/
启动Apache
#apachectl start
设置Apache开机自启动
#vi /etc/rc.d/rc.local
增加一行 /sbin/apachectl start
或者将httpd服务添加到ntsysv服务管理工具
#apachectl stop //关闭Apache以免不必要的麻烦
#cp /usr/local/httpd/bin/apachectl /etc/rc.d/init.d/httpd
#vi /etc/rc.d/init.d/httpd
修改为
#!/bin/sh
#
#chkconfig: 345 85 15 //#不能省略，注意空格
#description: httpd for 52lamp 20101016 21:54 //任意字符串
#
......
第二行中345的含义：
# 0 - operation completed successfully
# 1 -
# 2 - usage error
# 3 - httpd could not be started
# 4 - httpd could not be stopped
# 5 - httpd could not be started during a restart
修改有关权限
#cd /etc/rc.d/init.d/
#chmod a+x httpd
#chkconfig --add httpd
#ntsysv
httpd已经在列表中，按F1可以看到刚才编写的服务描述httpd for 52lamp 20101016 21:54。
#apachectl start
#ps -e |grep httpd
23247 ? 00:00:00 httpd
23248 ? 00:00:00 httpd
23249 ? 00:00:00 httpd
23251 ? 00:00:00 httpd
23252 ? 00:00:00 httpd
在浏览器中输入127.0.0.1，看起来一切正常；但是局域网内其他电脑不能访问！
#service iptables stop
如果不想关闭防火墙，放开80端口即可。
#vi /etc/sysconfig/iptables
增加一行-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
#service iptables restart //重启防火墙
现在一切OK
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进入apache的安装目录:
Windows : D:\Program Files\Apache Software Foundation\Apache2.2\conf
linux : /usr/local/apache/conf
用记事本打开httpd.conf
将里面的#ServerName localhost:80注释去掉即可。
再执行httpd
然后可以通过浏览器访问http://localhost：80，如果页面显示“It works！”，即表示apache已安装并启动成功。
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