Php – Install PHP OAuth Extension In Snow Leopard

I am trying to install the PHP OAuth extension in Snow Leopard, I'm using the bundled Apache Web server and PHP 5.3.2 by Apple, which is working just fine.

When I type in Terminal:

sudo pecl install oauth

oauth-1.0.0.tgz downloads fine, but then I get this error:

WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update  
downloading oauth-1.0.0.tgz ...  
Starting to download oauth-1.0.0.tgz (42,834 bytes)  
............done: 42,834 bytes  
6 source files, building  
running: phpize  
grep: /usr/include/php/main/php.h: No such file or directory  
grep: /usr/include/php/Zend/zend_modules.h: No such file or directory  
grep: /usr/include/php/Zend/zend_extensions.h: No such file or directory  
Configuring for:  
PHP Api Version:  
Zend Module Api No:  
Zend Extension Api No:  
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

ERROR: `phpize' failed

I really have no idea this means or how to fix it, please help!