[CMake] Supress generation of a Makefile

[aditya siram]

Hi all,
I have a cross platform project where Linux/Mac users will use the standard
"autoheader;autoconf;./configure .." routine, but on Windows users will do
"cmake .; make".

I am using CMake solely to substitute some variables in some subdirectory
Makefile.in's.

The problem is that there is an existing Makefile in the root of the
project that must not be disturbed but keeps getting overwritten whenever I
run "cmake .".

How do I stop CMake from generating a Makefile?

Thanks!
-deech
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