cnijfilter : Canon InkJet Printer Driver for Linux (Pixus/Pixma-Series) ( https://www.canon-europe.com/support/consumer_products/products/printers/inkjet/pixma_ix_series/pixma_ix6840.html?type=drivers%26language=en%26os=linux%20(64-bit) )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a phackerlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/phackerlay-portage
If you have a problem : ycarus(-at-)zugaina.org