To anyone else having problems after a recent update: You may need to recompile. After installing yaml-cpp 0.6.3-1, I was getting this error:
/usr/bin/thinkfan: symbol lookup error: /usr/bin/thinkfan: undefined symbol: _ZN4YAML6detail9node_data12empty_scalarB5cxx11E
Recompiling and reinstalling thinkfan fixed the issue.
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