Newer versions exists :-) Works for me on ~amd64, both ebuilds in 'jasiu' overlay.
already .5
+*gnumeric-1.10.5 (01 Jun 2010) + + 01 Jun 2010; Gilles Dartiguelongue <eva@gentoo.org> + +gnumeric-1.10.5.ebuild: + Version bump, bug #322123. Print and sheet order dialog fixes. Add + non-linear solved. + Thanks for reporting.