Linux 源代码包配置PHP时出错：configure: error: GD build test failed. Please check the config.log

Ps: 正确解答此问题者，追加200分！不够的还可以增加！谢谢啊！
无语啊。。。本来已经搭建好的源码环境，结果由于PHP版本太高，无法用Zend ZendOptimizer。我就把PHP5.6.4给卸载了，然后想装一个5.2.6的：
结果在配置时始终出错啊：
配置语句：
# ./configure --prefix=/usr/local/php/ --with-config-file-path=/usr/local/php/etc/ --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/local/mysql/ --with-libxml-dir=/usr/local/libxml2/ --with-jpeg-dir=/usr/local/jpeg6/ --with-png-dir=/usr/local/libpng/ --with-freetype-dir=/usr/local/freetype/ --with-gd=/usr/local/gd2 --with-mcrypt=/usr/local/libmcrypt/ --with-mysqli=/usr/local/mysql/bin/mysql_config --enable-soap --enable-mbstring=all --enable-sockets
出错信息为：
configure: error: GD build test failed. Please check the config.log for details.
# cat config.log
发现错误如下（由于字数限制，下面省略了一些行）：
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_destroy_decompress@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_CreateCompress@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_read_header@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_read_scanlines@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_start_compress@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_destroy_compress@LIBJPEG_6.2'
…………
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_std_error@LIBJPEG_6.2'
/usr/local/gd2/lib/libgd.so: undefined reference to `jpeg_finish_compress@LIBJPEG_6.2'
这样的错误在config.log这个文件中出现了很多次。自己已经重装了jpeg6，重装了GD，都不行。。请问如何解决，非常感谢！

此问题已自己解决