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IF ("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}.${CMAKE_PATCH_VERSION}" VERSION_LESS "2.8.7")
FUNCTION(MESSAGE_ONCE id out)
MESSAGE(STATUS "${out}")
ENDFUNCTION()
ELSE()
FUNCTION(MESSAGE_ONCE id out)
STRING(MD5 hash "${out}")
IF(NOT __msg1_${id} STREQUAL "${hash}")
MESSAGE(STATUS "${out}")
ENDIF()
SET(__msg1_${id} ${hash} CACHE INTERNAL "")
ENDFUNCTION()
ENDIF()
MACRO(SET_IF_UNSET VAR VAL)
IF(NOT DEFINED ${VAR})
SET(${VAR} ${VAL})
ENDIF()
ENDMACRO()
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