Fix building on OpenBSD (#6637)
Only utilize librt if its presence is detected.
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@ -275,7 +275,10 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
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endif()
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if(UNIX AND NOT APPLE)
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set(MAYBE_RT_LIBRARY -lrt)
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find_library(RT_LIB rt)
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if (RT_LIB)
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set(MAYBE_RT_LIBRARY -lrt)
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endif()
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endif()
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find_package(Threads REQUIRED)
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