I'm working on packaging link-grammar for Debian, and I patched a few upstream bugs regarding the location of the dictionary. marienz on #gentoo checked for me and found that these bugs affect your ebuild also. Patches are available from the upstream bugzilla, and the package will need to be reautotooled after they are applied.
looks like this bug is fixed with 4.2.2 being stable, closing as fixed, thanks for the report and patch.