[CMake] CheckIncludeFiles.cmake Question

[Jack Morrison]

The conditional here:

https://github.com/Kitware/CMake/blob/master/Modules/CheckIncludeFiles.cmake#L42

causes me issues when called with CMAKE_HAVE_PTHREAD_H in FindThreads. It
evaluates to false, leaving pthread.h to not be found and FindThreads to
fail.

What is the purpose of this conditional and why would it cause this
FindThreads call to fail?

I am on OSX 10.9.2 with AppleClang using CMake 3.0.20140430 built from HEAD
with Homebrew.

Cheers,
Jack
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