If you receive
/usr/libexec/cups/filter/foomatic-rip failed
you could try
emerge --unmerge ghostscript-gpl cups foomatic-db \ foomatic-db-engine foomatic-db-ppds foomatic-filters \ foomatic-filters-ppds foomatic-gui emerge -va cups
Cups seems to use it’s own filters (less but one for different printers) then. Works perfectly now.
I got these options activated
X dbus jpeg nls pam php png samba
but not especially for cups (-> /etc/make.conf)
Thanks!