php libpng error

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PHP

I'm running a test machine setup to be used as localhost for development purposes. I've done a build from scratch of MySQL, Apache2, PHP5 with GD (libjpeg, libpng, and php's freetype and xpm), and Zend Framework. This is a MacBook Pro.

Everything is working great with exception of libpng. I'm getting the following error when running a captcha script that works on another machine:

PHP Warning: imagecreatefrompng(): gd-png error: cannot allocate libpng main struct in/Library/WebServer/Documents/.../kcaptcha.php on line 164

The line in the php file is:

$font=imagecreatefrompng($font_file);

Instead of the blue background image with text on it, all I get is the blue background.

I've set the entire site directory to 777, so I don't think it's a permission problem, unless there is a temp directory that';s not set right.

Any advise?

Thanks