Building kernel fails

[Vlad GALU]

    No matter what tag I fetch, buildkernel always fails while
linking the debug version of the kernel, claiming a number of
undefined references to __cursig.  It is defined in
sys/sys/signalvar.h as extern, even though the implementation is right
there. What am I missing ?
--
If it's there, and you can see it, it's real.
If it's not there, and you can see it, it's virtual.
If it's there, and you can't see it, it's transparent.
If it's not there, and you can't see it, you erased it.