[Koha] koha does not recognise my dbd::mysql module.

[gowthaman ramasamy]

hello list,
i have a problem in installing koha.
when i run the installer.pl script it says mysql::dbd module is not
installed and gave the following error.

export LC_ALL=C
perl -MCPAN -e 'install "DBD::mysql"'

But i myself downloaded this module and instlled it on my RH8 - p4
system.when i issue the above set command i says dbd::mysql is uptodate.
displays following ..
>>Database was generated on Mon, 24 Jan 2005 05:56:51 GMT
>>DBD::mysql is up to date.

can any one suggest a way to getaround. can i skip cheking for perl
modules. will that help.
many thanks in advance ..
with love
gowtham