app-text/gocr calls tkispell to spell-check it's current text buffer. I would have contributed an ebuild, but unfortuaely I know nothing about perl CPAN modules or g-cpan, which refused `g-cpan -g tkispell`.
tkispell is from 2004 with no updates http://search.cpan.org/~rkies/tkispell-0.18/ One of its deps is Tk-SimpleFileSelect also from 2004 with no updates http://search.cpan.org/~rkies/Tk-SimpleFileSelect-0.68/
* added dev-perl/tkispell * patched it to work with aspell's ispell-aspell compatibility script (we don't have ispell anymore) No idea if it works, but you got your wish. Perl out.
2018-10-15: GOCR 0.52 has been released. https://www-e.ovgu.de/jschulen/ocr/index.html