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# CheckIncludeFileCXX

Check if the include file exists.

    CHECK_INCLUDE_FILE_CXX(INCLUDE VARIABLE)

    INCLUDE  - name of include file
    VARIABLE - variable to return result

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

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