CUPS hpcac filter missing from hplip
When using CUPS printing manager, adding a network HP Color LaserJet 3800 printer produces an error:
"Printer [name] requires the 'hpcac' program, but it is not currently installed.
Please install it before using the printer."
The subsequent printing fails as well because of this. The actual hpcac is a script which is available in http://src.opensolaris.org/source/xref/sfw/usr/src/cmd/hplip/hplip-3.9.8/prnt/filters/hpcac
If manually copied to /usr/lib/cups/filter with 0555 permissions - it solves the problem. The problem is caused by hplip package omitting hpcac filter for some reason.