[Borgbackup] Warning: “Using a pure-python msgpack! This will result in lower performance.”

[Thomas Waldmann]

> “Using a pure-python msgpack! This will result in lower performance.”

Usually you get this warning because it could not compile the C++
implementation of msgpack and just falls back to the Python
implementation. Often this is due to a missing C++ compiler.

So, just check if you can execute: g++ --version

That's maybe a helpful command to force the reinstallation of msgpack
into your virtualenv:

pip install -v --upgrade --force-reinstall --no-cache-dir msgpack-python


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