kio build problem

[Mark Davies <mark%ecs.vuw.ac.nz@localhost>]

I'm trying to build wip/kio on NetBSD-7.0_STABLE/amd64 and the build 
dies with:

[ 34%] Linking CXX shared module kcookiejar.so
CMakeFiles/kded_kcookiejar.dir/kcookieserver.cpp.o: In function 
`KdedCookieServerFactory::~KdedCookieServerFactory()':
kcookieserver.cpp:(.text+0x3): undefined reference to `vtable for 
KdedCookieServerFactory'
CMakeFiles/kded_kcookiejar.dir/kcookieserver.cpp.o: In function 
`KdedCookieServerFactory::~KdedCookieServerFactory()':
kcookieserver.cpp:(.text+0x1b): undefined reference to `vtable for 
KdedCookieServerFactory'
CMakeFiles/kded_kcookiejar.dir/kcookieserver.cpp.o: In function 
`KdedCookieServerFactory::KdedCookieServerFactory()':
kcookieserver.cpp:(.text+0x130): undefined reference to `vtable for 
KdedCookieServerFactory'


I'm currently stuck on whats going on here and how to fix it.
Any suggestions appreciated.

cheers
mark