ideodog is a command line tool, just based on a stock linux distro, with no need of special libraries, or graphic enviroment ( as xlib, imlib). The only special lib is jpeglib, present in most of systems, but you can work without it (see INSTALL). I
libgd linux上的图片拓展，php生成验证码需要用到，原官网经常无法下载
centos下安装方式
---------------------
tar -zxf libgd-2.2.5.tar.gz
cd libgd-2.2.5
./configure --prefix=/usr/local/gd2 --with-jpeg --with-png --with-zlib --with-freetype --with-fontconfig
make
make install
