php服务器架设过程中zend问题！

php服务器架设过程中zend问题！
具体情况如下，请高手帮忙！！
# php -v
Failed loading /usr/local/Zend/lib/Optimizer-3.2.0/php-5.1.x/ZendOptimizer.so:  /usr/local/Zend/lib/Optimizer-3.2.0/php-

5.1.x/ZendOptimizer.so: cannot restore segment prot after reloc: Permission denied
PHP 5.1.6 (cli) (built: Dec 19 2006 11:18:44)
Copyright (c) 1997-2006 The PHP Group
Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies
    with Zend Extension Manager v1.0.11, Copyright (c) 2003-2006, by Zend Technologies

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等待高手的答复。