[CMake] How to find wxWidgets with cmake under Windows?

[Bob Paddock]

I need to build wxWidgets, under Windows XP with MingW.

I have a Linux CMakeLists.txt that works fine under Linux,
but cmake 2.6 under Windows tells me "wxWidgets not found".

I have installed wx288.exe that should have set the registry key,
and I have set wxwin to point at C:\wxwidgets-2.8.8

What does it take for cmake to find wxWidgets?