My suggestion to you would be to check your @INC paths. Try this snippet:

perl -e 'print $_,$/ for (@INC);'
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The output for me (on my Slackware 8.0 box with perl 5.6.1) is:

tessai@clc-tessai(~))$ perl -e 'print $_,$/ for (@INC);'
/usr/lib/perl5/i386-linux
/usr/lib/perl5
/usr/lib/perl5/site_perl/i386-linux
/usr/lib/perl5/site_perl
/usr/lib/perl5/site_perl
.
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I'm guessing that the smbclient module (which I didn't know about, but now I'm going to search for) is installing itself in the wrong place. It may be assuming a newer version of Perl, or a certain @INC structure. I believe you can change the install paths when you run 'perl Makefile.pl' or by editing the Makefile directly (probably way too messy).

Update: Can you please post the relevant portion of the script you're running? Just the first few lines that contain the use statements. It may just be that you misspelled the name of the module (I've been bitten by that before).

Theodore Charles III
Network Administrator
Los Angeles Senior High
email->secon_kun@hotmail.com
perl -e "map{print++$_}split//,Mdbnr;"