emerge cups prompt

* Your USB printers will be managed via libusb. In case you run into problems,
* please try disabling USB_PRINTER support in your kernel or blacklisting the
* usblp kernel module.
* Alternatively, just disable the usb useflag for cups (your printer will still work).
* For information about installing a printer and general cups setup
* take a look at: https://wiki.gentoo.org/wiki/Printing
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