jsoncpp: Require version 1.6.0 when using system-provided library
We need the `ValueIterator::name()` method.
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@ -648,7 +648,7 @@ macro (CMAKE_BUILD_UTILITIES)
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#---------------------------------------------------------------------
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# Build jsoncpp library.
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if(CMAKE_USE_SYSTEM_JSONCPP)
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find_package(JsonCpp 1.4.1)
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find_package(JsonCpp 1.6.0)
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if(NOT JsonCpp_FOUND)
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message(FATAL_ERROR
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"CMAKE_USE_SYSTEM_JSONCPP is ON but a JsonCpp is not found!")
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