That means the 15'th eval, on line 16, had the error.

The easiest way to make this error more understandable is to go to the last section of perlsyn and convince Perl to give you a more informative label for the eval than just "eval 15".

UPDATE
I should mention that in 5.005_03 there is a bug. The preprocessor directive will not work if it is the first line of an eval. So add a return before the first line. (You will be setting the line number anyways so it doesn't really matter.)