how to install letodms in linux

[sappu]

hello every one, iam trying to install letodms in my centos.
i run in browser but i error

Warning
Zend Framework : Not found
=> Install Zend Framework, if you intend to use the full text search engine

also what to enter in following field

Server settings
Root directory:/var/www/html/letodms
Http Root: /letodms
Content directory:
Directory for full text index:
Directory for partial uploads:
Core letoDMS directory:
Lucene LetoDMS directory:
Database settings
ADOdb Path:
Database Type:
Server name:
Database:
Username:
Password:

i searched for installing but still facing issue.pls guide me proper insalling of letodms..

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i restart the httpd service and now it gives error
Error
Pear package : Log : Not found
=> Install Pear package 'Log'
Warning
Pear package : HTTP_WebDAV_Server : Not found
=> Install Pear package 'HTTP_WebDAV_Server', if you intend to use the webdav interface
Warning
Zend Framework : Not found
=> Install Zend Framework, if you intend to use the full text search engine

Apache version: Apache/2.2.3 (CentOS)
PHP version: 5.2.10



well i already installed these Log and HTTP.....and trying to insatll zendframework...


any solution

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#pear install Log
PHP Warning: Module 'imap' already loaded in Unknown on line 0
PHP Warning: Module 'mysql' already loaded in Unknown on line 0
pear/Log is already installed and is the same as the released version 1.12.7
install failed