Actually, your problem is not with WWW::Mechanize, but with HTML::DOM respectively HTML::DOM::Interface.

Looking at line 83, I see the following code:

...
# (which was just hack after hack),  but is  now  maintained  manually
+.

0 and q r

=for ;

  our @EXPORT_OK = qw/METHOD VOID READONLY BOOL STR NUM OBJ TYPE/;
...
[download]

Which seems to be a weird "comment block" commenting between the q r and the =for line. I don't know why this triggers a Perl error, but it might be that your (unstated) version of Perl copes differently with the POD directives, or some preprocessing part of PAR strips the POD and thus wrongly messes up the code.

If you strip out these three lines, you should get a different error or it should work.

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