[root@web1 ~]# pecl install apc 

downloading APC-3.1.9.tgz ... 

Starting to download APC-3.1.9.tgz (155,540 bytes) 

.................................done: 155,540 bytes 

54 source files, building 

running: phpize 

Configuring for: 

PHP Api Version: 20041225 

Zend Module Api No: 20060613 

Zend Extension Api No: 220060519 

/usr/bin/phpize: /tmp/pear/temp/APC/build/shtool: /bin/sh: bad interpreter: Permission denied 

Cannot find autoconf. Please check your autoconf installation and the 

$PHP_AUTOCONF environment variable. Then, rerun this script. 

ERROR: `phpize' failed 

The problem is caused by the /tmp/ filesystem being mounted noexec, which keeps any programs on /tmp/ from being allowed to be executed, which breaks the install script. 

To remount /tmp/ as executable, use: 

[root@web1 ~]# mount -o remount,exec,suid /tmp 

The it should install correctly. 

After the install is done, remount the /tmp/ filesystem with the noexec permissions reset. 

[root@web1 ~]# mount -o remount,noexec,nosuid /tmp 

关键字：安装编译、centos