Ok, I slightly lied. Log file after that change shows...
[Wed Aug 23 21:15:48 2006] [error] [client 71.206.116.70] Premature end of script headers: wakaba.pl
[Wed Aug 23 21:15:48 2006] [error] [client 71.206.116.70] Can't locate object method "require_version" via package "DBI" at D:/Perl/lib/DBI.pm line 22.
[Wed Aug 23 21:15:48 2006] [error] [client 71.206.116.70] Compilation failed in require at C:/Web Root/HTTP Root/wakaba/wakaba.pl line 7.
[Wed Aug 23 21:15:48 2006] [error] [client 71.206.116.70] BEGIN failed--compilation aborted at C:/Web Root/HTTP Root/wakaba/wakaba.pl line 7.