PECL Install Error: /bin/sh: bad interpreter: Permission denied

When I tried to use PECL to install APC. I got error below :

downloading APC-3.0.19.tgz ...
Starting to download APC-3.0.19.tgz (115,735 bytes)
.........................done: 115,735 bytes
47 source files, building
WARNING: php_bin /usr/local/php5/bin/php appears to have a suffix 5/bin/php, but config variable php_suffix does not match
running: phpize
Configuring for:
PHP Api Version:         20041225
Zend Module Api No:      20060613
Zend Extension Api No:   220060519
/usr/local/php5/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

Then, I realized that I did something with /tmp partition for security reason. So, I have to temporary disable it by using command below:

mount -o remount,exec /tmp

After installed extension, just remount /tmp partition again.

mount -o remount,noexec /tmp