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find_package(UseComponents OPTIONAL_COMPONENTS Comp1 Comp2 Comp3)
if (NOT UseComponents_FOUND)
message (FATAL_ERROR "package UseComponents Not Found.")
endif()
if (NOT UseComponents_Comp1_FOUND)
message (FATAL_ERROR "package UseComponents, component Comp1 not found.")
endif()
if (NOT UseComponents_Comp2_FOUND)
message (FATAL_ERROR "package UseComponents, component Comp2 not found.")
endif()
if (UseComponents_Comp3_FOUND)
message (FATAL_ERROR "package UseComponents, component Comp2 unexpectedly found.")
endif()
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