installation faild:PHP MB string support: no

[iwgwtw]

Hi
I installed zabbix1.8.3 . I has installed the php-mbstring and got the error:PHP MB string support: no

What could i do?


PHP version: 5.1.6 Ok
PHP Memory limit: 256M Ok
PHP post max size: 32M Ok
PHP max execution time: 600 sec Ok
PHP Timezone: Asia/Shanghai Ok
PHP Databases support: MySQL Ok
PHP BC math support: yes Ok
PHP MB string support: no Fail
PHP MB string overload: yes Ok
PHP Sockets support yes Ok
GD Version: bundled (2.0.28 compatible) Ok
Image formats: PNG Ok

Fail

Please correct all issues and press "Retry" button