C:\dev>perl comparing_files_3_using_text_diff.pl ./file_compare_on_lists Can't locate package Text::Diff::Base for @Text::Diff::Table::ISA at comparing_f iles_3_using_text_diff.pl line 4. Backslash found where operator expected at comparing_files_3_using_text_diff.pl line 20, near "diff \" (Do you need to predeclare diff?) syntax error at comparing_files_3_using_text_diff.pl line 20, near "diff \" Global symbol "%format" requires explicit package name at comparing_files_3_usin g_text_diff.pl line 20. Global symbol "@results" requires explicit package name at comparing_files_3_using_text_diff.pl line 22.