installing 3.3.5 error with php extension

[Fonsjnsn]

Can anyone help me with the following error

Immediately after starting the installation I get a message

Error
PHP extension : php_'see current value' : Not found
=> Current value : _DBC_DBTYPE_
=> Activate PHP extension

Futher details

Letodms 3.3.5 on a ClearOs 6.2 server.
Apache version: Apache/2.2.15 (ClearOS Core)
PHP version: 5.3.3
LetoDMS directory : var/www/html/LetoDMS
LetoDMS Core : var/www/html/LetoDMS/LetoDMS_Core
LetoDMS Lucene :var/www/html/LetoDMS/LetoDMS_Lucene
adodb : var/www/html/LetoDMS/adodb


any solution. Thanks in advance