Zend Studio, PHP CLI Debugging, Macintosh - libltdl.3.dylib

I was receiving the error:

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/zend/lib/php_extensions/mcrypt.so' - dlopen(/usr/local/zend/lib/php_extensions/mcrypt.so, 9): Library not loaded: /usr/lib/libltdl.3.dylib
Referenced from: /usr/local/zend/lib/php_extensions/mcrypt.so
Reason: image not found in Unknown on line 0

To solve this problem, I copied the library libltdl.3.dylib:

$ sudo cp /usr/local/zend/lib/libltdl.3.dylib /usr/lib