RFC822Parser build error on gump

[Nick Burch]

Hi All

Anyone have any idea about this compiler error on the tika parsers project 
as hit by gump?
http://vmgump.apache.org/gump/public/tika/tika-parsers/gump_work/build_tika_tika-parsers.html
Gump notifications will hopefully start again soon, which'd let us find 
out about breaking changes from upstream Apache projects in advance, so 
it'd be good to get the build working ready!

Nick