Bundled GD compiling?

I'm confused as to certain issues regarding the bundled version. The documentation says:: "To use the recommended bundled version of the GD library (which was first bundled in PHP 4.3.0), use the configure option --with-gd. GD library requires libpng and libjpeg to compile." "Note: When compiling PHP with libpng, you must use the same version that was linked with the GD library." This (to me) seems ambiguous. How am I suppose to know which libpng the bundled GD library used? So how should I configure? http://www.libgd.org/FAQ_PHP "./configure --with-gd -with-png-dir=/usr --with-jpeg-dir=/usr --with-freetype-dir=/usr'" The FAQ says this is "all" the features? Thanks a bunch.