[Koha] how to enable marc export in opac

[cyberarian]

dear all

with reference to
http://search.athenscounty.lib.oh.us/cgi-bin/koha/opac-detail.pl?bib=142616i
want to know how to enable marc data export from opac.  liblime has
enabled this one.  can it be the part of koha?

regards
cyberarian
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