[CMake] Unknown CMake command "UNSET".

[Aaron_Wright at selinc.com]

I'm not trying to do anything too fancy, just trying to call:

UNSET(<variable> CACHE)

It works with MSVC, but in linux I get:

Unknown CMake command "UNSET".

Am I missing something? Linux is version 2.6.2, and MSVC is 2.6.4. I'm 
asking first because I don't want to update the linux version, as that is 
difficult.
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Aaron Wright
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