ImathExport.h

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#if defined(OPENEXR_DLL)
    #if defined(IMATH_EXPORTS)
            #define IMATH_EXPORT __declspec(dllexport)
        #define IMATH_EXPORT_CONST extern __declspec(dllexport)
    #else
            #define IMATH_EXPORT __declspec(dllimport)
            #define IMATH_EXPORT_CONST extern __declspec(dllimport)
    #endif
#else
    #define IMATH_EXPORT
    #define IMATH_EXPORT_CONST extern const
#endif