Rebuilding CETK Tests - Software-Testing

I have re-built the laptest.dll with issues fixed from
MS. I was not able to link that dll because the linker
could not find kato.lib. It seems that there is a method
to resolve that by building the "dummy" project in the
\Private\Test\External folder. The makefile.inc looks
for _WINCEPBIDE to be set - where is that variable set?
I can't seem to find it. Also the sources file specs a
tst_external target and only a lib file of that name will
get copied to the proper destination folder for linking,
not the others required. Looking at the "copylibs" tag,
as well as the related page on MSDN, suggests that all
appropriate lib files get copied. Can someone please
explain this?