本节内容：
php gd库的安装与配置。
完整步骤如下，大家参考下。
1，安装zlib，一般centos系统自带已经安装好，可以用以下命令去查看：
不存在的话，请手动下载编译：http://ishare.iask.sina.com.cn/f/15275772.html
2，安装libpng http://sourceforge.net/projects/libpng/
3.安装freetype http://sourceforge.net/projects/freetype/
tar zxvf freetype-2.3.12.tar.gz
cd freetype-2.3.12
./configure
make
make install
4，安装Jpeg http://www.ijg.org/
tar zxvf jpegsrc.v8b.tar.gz
cd jpeg-8b/
./configure --enable-shared
make
make test
make install
注意，这里configure一定要带--enable-shared参数，不然，不会生成共享库。
5，安装GD https://bitbucket.org/pierrejoye/gd-libgd/downloads
tar zxvf gd-2.0.33.tar.gz
cd gd-2.0.33
./configure --with-png --with-freetype --with-jpeg
make
make install
6，安装PHP php-5.2.11.tar.gz
tar zxvf php-5.2.11.tar.gz
cd php-5.2.11
./configure选项见下方
make
make install
注：
/usr/local/include/freetype2/freetype
freetype
/usr/local/include/include
t1lig
/usr/local/include/libpng14/
png
/usr/local/include
jpeg
[root@jbxue php-5.2.11]# ./configure --help | grep t1lib
--with-t1lib[=DIR] GD: Include T1lib support. T1lib version >= 5.0.0 required
[root@jbxue php-5.2.11]# ./configure --help | grep png
--with-png-dir[=DIR] GD: Set the path to libpng install prefix
[root@jbxue php-5.2.11]# ./configure --help | grep jpeg
--with-jpeg-dir[=DIR] GD: Set the path to libjpeg install prefix
[root@jbxue php-5.2.11]# ./configure --help | grep freetype
--with-freetype-dir[=DIR] GD: Set the path to FreeType 2 install prefix
[root@jbxue php-5.2.11]#
./configure --prefix=/opt/php5 --with-apxs2=/opt/apache/bin/apxs --with-mysql=/usr/local/mysql --with-config-file-path=/opt/php5/lib --with-gd --with-zlib --with-png-dir=/usr/local/include/libpng14/ --with-jpeg-dir=/usr/local/include --with-freetype-dir=/usr/local/include/freetype2/freetype （--with-t1lib --with-t1lib-dir=/usr/local/include/include）
最后只有T1Lib Support没有启用。
GD库支持最终如下：
在apache配置文件中添加：
Listen 81
#
# Dynamic Shared Object (DSO) Support
#
# To be able to use the functionality of a module which was built as a DSO you
# have to place corresponding `LoadModule' lines at this location so the
# directives contained in it are actually available _before_ they are used.
# Statically compiled modules (those listed by `httpd -l') do not need
# to be loaded here.
#
# Example:
# LoadModule foo_module modules/mod_foo.so
LoadModule php5_module modules/libphp5.so
AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps
#
<IfModule !mpm_netware_module>
在htdocs目录中创建测试文件info.php：
然后，在浏览器中访问该文件，可查询GD库支持的情况。