GD and JPEG

OK, here is the bane in my otherwise dull existance ... :-) I've been trying to compile PHP 4.0.4pl1 with GD 1.8.3 and JPEG and PNG support. GD compiles fine, and is fairly happy in it's own little artsy universe doing what it does. However, when I compile PHP, it will recognize the PNG support, but no JPEG support is compiled. I know I'm most likely being really stupid and I'm overlooking something crucial in the docs. Has anyone overcome this particular problem before? Here is the configure command I used: ./configure --with-gd=/usr/local --with-jpeg-dir=/usr/local --with-zlib-dir=/usr/local Any help would be greatly appreciated ...