出现如下错误u：

always_po.....date=-1 才是关闭，，害的我查了半天，其它的要么是1 要么是off，，，做个记号！！！

因为jpeg freetype没有开启支持，，安装yum install libjpeg-devel freetype-devel libpng-deve
make clean后重新./configure
make&make install
查看phpinfo OK了

方法二：
下面我们来添加 jpeg 格式文件的支持

wget http://www.ijg.org/files/jpegsrc.v8b.tar.gz

tar -zxvf jpegsrc.v8b.tar.gz
cd jpeg-8b

./configure --prefix=/usr/local/jpeg --enable-shared --enable-static
make && make install

下面进入到 php 源码目录下的 ext 下的 gd目录

进入gd 目录后执行注意下面的 /usr/local/php/ 是你服务器 php的安装路径。我的是这个路径就写成这样了

/usr/local/php/bin/phpize

./configure --with-php-config=/usr/local/php/bin/php-config --with-jpeg-dir=/usr/local/jpeg/

make && make install

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Build complete.
Don't forget to run 'make test'.

Installing shared extensions: /usr/lib/php/modules/
Installing header files: /usr/include/php/
[root@gc1.cuug.net: /root/php-5.6.12/ext/gd]$ ls -l /usr/lib/php/modules
total 3240
-rwxr-xr-x 1 root root 30928 Feb 26 2009 bcmath.so
-rwxr-xr-x 1 root root 28200 Feb 26 2009 dbase.so
-rwxr-xr-x 1 root root 141668 Feb 26 2009 dom.so
-rwxr-xr-x 1 root root 928464 Sep 2 02:43 gd.so
-rwxr-xr-x 1 root root 44204 Feb 26 2009 ldap.so
-rwxr-xr-x 1 root root 1719664 Feb 26 2009 mbstring.so
-rwxr-xr-x 1 root root 106188 Feb 26 2009 mysqli.so
-rwxr-xr-x 1 root root 48996 Feb 26 2009 mysql.so
-rwxr-xr-x 1 root root 23692 Feb 26 2009 pdo_mysql.so
-rwxr-xr-x 1 root root 82516 Feb 26 2009 pdo.so
-rwxr-xr-x 1 root root 19948 Feb 26 2009 pdo_sqlite.so
-rwxr-xr-x 1 root root 13036 Jun 9 2009 phpcups.so
-rwxr-xr-x 1 root root 23040 Feb 26 2009 xmlreader.so
-rwxr-xr-x 1 root root 32184 Feb 26 2009 xmlwriter.so
-rwxr-xr-x 1 root root 23140 Feb 26 2009 xsl.so

然后在php.ini
加上一句：
extension=/usr/lib/php/modules/
重新启动apache即可看到已经加载mysqli成功。
===经测试，可以不用加路径：
直接extension=mysqli.so即可。

参考资料：http://linux.chinaunix.net/techdoc/database/2008/01/16/976742.shtml

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jpeg,freetype不支持

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