or download this
perl -Mdiagnostics -Mdummy
Can't locate dummy.pm in @INC (@INC contains: /etc/perl /usr/local/lib
+/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/p
+erl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl
+ .).
...
the extra library is, or maybe the script needs to add the library
+ name
to @INC. Or maybe you just misspelled the name of the file. See
perlfunc/require and lib.