Can’t locate Nagios/Plugin.pm

Hi,

I download your plugin to test it, but when I try to use it it give me this error

Can’t locate Nagios/Plugin.pm in @INC (@INC contains: /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .) at /usr/local/nagios/libexec/check_rbl line 35.
BEGIN failed–compilation aborted at /usr/local/nagios/libexec/check_rbl line 35

My Nagios/Plugin.pm located in /usr/local/nagios/perl/lib/Nagios/Plugin.pm

How to configure it to search for the plugin in this path /usr/local/nagios/perl/lib/

I install it using perl Makefile.PL INSTALLSITESCRIPT=/usr/local/nagios/libexec/

Thanks