[CMake] Why does ExternalProject require root access?

[Ansis Māliņš]

> I use add_subdirectory to add bullet and sdl.. Could you try that?
That's what I tried initially, but another external project dependent on
Bullet, btOgre, failed to find_package(Bullet). I think it's because when
CMake configures btOgre it expects Bullet binaries to be built and
installed already.
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