whe I try to using rdp protocol in krdc it says: Could not start "xfreerdp"; make sure xfreerdp is properly installed.
It's an optional run-time dependency, and there's a USE flag for it (naughty) due to the number of dupes.
I did not search for closed bugs...anyway, I guess the primarily function of this program is the rdp protocol that cannot be turned off via USE, so in my opinion make freerdp optional make a sort of non-sense.
Fixed as per discussion on IRC. krdc supports both vnc (buildtime) and rdesktop (runtime), but requires at least one to be useful. Since rdesktop does not affect the build and has been the source of numerous bug reports we've chosen that one. + 09 Dec 2014; Michael Palimaka <kensington@gentoo.org> krdc-4.14.3.ebuild: + Enable rdesktop USE flag by default wrt bug #530968. https://github.com/gentoo/kde/commit/31acaa85a6721c209a2f190d740aab2f8a965a3a