[CMake] CMake can't find sys/types.h

[Michael Leong]

I'm running CMake 2.6.4 on CentOS 4, just upgraded from CMake 2.4. All of a sudden, it can't find sys/types.h, despite it being right there in /usr/include. Is there some variable or something I can check or set to ensure it looks in the right place?
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