Rt_logins_email2ldap -h gives cannot locate errors in @(INC

I have RT 3.8.2; I have followed the wiki for external authentication. Now,
I am at the step where I have to clean the emal addresses for ldap
usernames. the wiki for this is

I changed “use lib” in the code to use lib qw(/data/rt3/lib); All the
external authentication modules are located in

When I run ./rt_logins_email2ldap -h, I get errors as follows:
Can’t locate RT/Authen/ExternalAuth.pm in @INC (@INC contains: /data/rt3/lib
/usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl
/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at
/data/rt3/lib/RT.pm line 625.

Can anyone assist on this issue?

Thank you in advance … sbu