[CMake] autoheader

[Bill Hoffman]

I have seen several requests for an autoheader type function to be added 
to CMake.  I have never used autoheader, but I gather it takes a list of 
variables and generates a config.h.in file automatically.  Does anyone 
on the list have experience with autoheader?   If so, what would a nice 
CMake api for something like this look like?

Thanks.

-Bill