error building kioslaves

[...]

Linking CXX shared module kcm_media.so
CMakeFiles/kded_mediamanager-module.dir/halbackend.cpp.o: In function 'HALBackend::MainLoopIntegration(DBusConnection*)':
halbackend.cpp:(.text+0x41e): undefined reference to 'DBusQt::Connection::Connection(QObject*)'
halbackend.cpp:(.text+0x43f): undefined reference to 'DBusQt::Connection::dbus_connection_setup_with_qt_main(DBusConnection*)'
collect2: ld returned 1 exit status
make[2]: *** [kioslave/media/mediamanager/kded_mediamanager.so] Error 1
make[1]: *** [kioslave/media/mediamanager/CMakeFiles/ded_mediamanager-module.dir/all] Error 2
make[1]: Waiting for unfinished jobs....

[...]

ERROR: trinity-base/kdebase-kioslaves-3.5.13 failed (compile phase):
Make failed!

Call stack:
  ebuild.sh, line 85: called src_compile
environment, line 3288: Called cmake-utils_src_compile
environment, line 924: Called _execute_optionaly 'src_compile'
environment, line 512: Called enable_cmake-utils_src_compile
environment, line 1191: Called cmake-utils_src_make
environment, line 943: Called die
The specific snippet of code:
	emake "$@" || die "Make failed!";

[if you need assistance, etc/irrelevant to non-gentoo specific issues]