Could an einfo line be added to the gnucash ebuild, probably in pkg_postinst that says, run 'update-finance-quote' to get perl libraries for the price editor in gnucash. I just had to run that in order to get online quotes from gnucash's price editor, and figure the ebuild should have something about that. Maybe also add it to pkg_config and change the einfo line to say to run ebuild gnucash.ebuild config.
*** This bug has been marked as a duplicate of 7186 ***