centos下安装phalcon提示成功，phpinfo找不到相关记录

第一次在linux下安装phalcon,我的系统是centos 6.2，安装结果如下:

Libraries have been installed in:
   /data/soft/cphalcon/build/64bits/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

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/lib64/php/modules/

Thanks for compiling Phalcon!
Build succeed: Please restart your web server to complete the installation

看提示已经安装成功了吧？ 但是phpinfo（）中输出却没有任何phalcon信息，程序也执行不了，请问是什么问题？


查看apache的 error_log文件发现有这样的错误

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/phalcon.so' - /usr/lib64/php/modules/phalcon.so: undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0



我貌似遇到过此问题，当初检查步骤这样:

1.查看你的/etc/php.d 目录下有无phalcon.ini 的文件
2. 如果没有在/etc/php.d里面建一个phalcon.ini的文件，内容写上  extension=phalcon.so
3.重启apache看看.