2012/11/11 Serghei Amelian <serghei@thel.ro>

Do not override/pollute CMAKE_REQUIRED_INCLUDES, you can fall into another
strange and hard to hunt bugs.

Correct way:

tde_save_and_set( CMAKE_REQUIRED_INCLUDES ${FRIBIDI_INCLUDE_DIRS} )
check_include_file( fribidi/fribidi-types.h FRIBIDI_NEW_FILENAME )
tde_restore( CMAKE_REQUIRED_INCLUDES )

It's a good practice, but here it is no difference...

CMAKE_REQUIRED_INCLUDES remains set only until end of file and there is no other compilations...