Your package depends explicitly on dev-lang/ruby:1.8. Versions in this slot are no longer supported upstream and this slot will be removed from Gentoo shortly. Please adapt your package to use a newer slot of ruby or mask it for removal if it is not compatible.
Please check also http://dev.zuckschwerdt.org/openobex/ticket/49
*obexftp-0.23-r2 (05 Nov 2013) 05 Nov 2013; Manuel Rüger <mrueg@gentoo.org> +files/obexftp-0.23-fix-ruby19.patch, +obexftp-0.23-r2.ebuild: NMU: Update ebuild to work with ruby 1.9 only. Fixes bug #483096.