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# CheckIncludeFile

macro which checks the include file exists.

CHECK_INCLUDE_FILE(INCLUDE VARIABLE)

    INCLUDE  - name of include file
    VARIABLE - variable to return result
               Will be created as an internal cache variable.

an optional third argument is the CFlags to add to the compile line or you can use CMAKE_REQUIRED_FLAGS

The following variables may be set before calling this macro to modify the way the check is run:

    CMAKE_REQUIRED_FLAGS = string of compile command line flags
    CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
    CMAKE_REQUIRED_INCLUDES = list of include directories
    CMAKE_REQUIRED_QUIET = execute quietly without messages

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