[CMake] Alternative toolchains? (alchemy, android ndk)

[Doug]

I've seen a few things that use alternative gnu toolchains to build things.

I haven't been able to figure out how to do this with cmake. Has anyone
managed?

Examples:
http://labs.adobe.com/technologies/alchemy/
http://developer.android.com/sdk/ndk/index.html

Basically it seems I somehow need to cutout the root /usr/include and pass a
new one in, as well as a specific alternative version of gcc; but I can't
figure out how to do that in the cmake directives...

~
Doug.
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