====== gd ======
  * first install [[libpng]], [[libjpeg]], [[freetype2]], [[fontconfig]]
  * download gd source from: http://www.libgd.org
<code>
./configure --prefix=/usr/local --with-png=/usr/local --with-freetype=/usr/local --with-fontconfig=/usr/local --with-jpeg=/usr/local

make

sudo make install
</code>