GD 라이브러리 설치
mkdir /usr/local/gd-lib
zlib
http://zlib.net/zlib-1.2.8.tar.gz
tar zxvf zlib-1.2.8.tar.gz
./configure --shared --prefix=/usr/local/gd-lib/zlib-1.2.8
make
make install
png
http://prdownloads.sourceforge.net/libpng/libpng-1.6.21.tar.gz
./configure --prefix=/usr/local/gd-lib/libpng-1.6.21
gd
https://github.com/libgd/libgd/releases/download/gd-2.1.1/libgd-2.1.1.tar.gz