i am new to setting php servers, and i had go though other related post, seems like nobody have the same error as i have.
I am using MAMP 2.0.2, and running PHP 5.3.6,
and I
PECL Modules are compiled modules, in order to install them, you need the PHP headers. You can found the headers on php.net/downloads.php make sure you download a version which match with your PHP version. Then you can follow this : Installing PHP OAuth in MAMP environment