Using Drush on Mac with MAMP
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Just got stuck with this. When using MAMP and Drush, you need to specify the PHP path so that both use the same PHP.

http://drupal.org/node/1296594#comment-5443454

Basically, you just need to export DRUSH_PHP in .bash_profile.

export DRUSH_PHP="/Applications/MAMP/bin/php/php5.2.17/bin/php"

Run source ~/.bash_profile to take it effect.