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# CheckLibraryExists

Check if the function exists.

CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)

    LIBRARY  - the name of the library you are looking for
    FUNCTION - the name of the function
    LOCATION - location where the library should be found
    VARIABLE - variable to store the result

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_LIBRARIES = list of libraries to link

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