gtk and CUPS integration.

[gerald_clark]

This probably needs fixing in all repos.
gtk2 appears not to have CUPS integration compiled in.
This makes printing very difficult with firefox and seamonkey, and may be why chromium-browser locks up if printing is attempted.
I tried editing .gtkrc-2.0 as described in the following bug report.  I can remove file and lpr from the print list but cannot get CUPS printers
to be seen.

https://bugzilla.mozilla.org/show_bug.cgi?id=460318

----Edit----
I checked the gtk3 Apps, and their priint dialog box shows CUPS printers.

[Juanito]

It looks like /usr/local/lib/gtk2/2.10.0/printbackends/libprintbackend-cups.so is missing - cups-dev needs to be present at compile time.