No, I didn't get any clues as to how this is handled. In ITK it is
handled subtly, which is to say I couldn't figure out how it worked
from reading the CMakeLists.txt.
What I ended up doing is to create the Config file twice -- once for
the eventual installation, and once for the in-place usage.
I need to do what ITK does -- generate one set of *Config.cmake and
Use*.cmake files for the build tree, so it can be used in place, and a
second set to be installed when 'make install' is run.
Looking through the Insight CMakeLists.txt files I'm not seeing how or
where the files intended for the
