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# Trezor
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## Messages rebuild
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Install `protoc` for your distribution. Requirements:
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- `protobuf-compiler`
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- `libprotobuf-dev`
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- `python`
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Soft requirement: Python 3, can be easily installed with [pyenv].
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If Python 3 is used there are no additional python dependencies.
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Since Cmake 3.12 the `FindPython` module is used to locate the Python
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interpreter in your system. It preferably searches for Python 3, if none
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is found, it searches for Python 2.
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Lower version of the cmake uses another module which does not guarantee
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ordering. If you want to override the selected python you can do it in
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the following way:
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```bash
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export TREZOR_PYTHON=`which python3`
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```
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### Python 2.7+
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Python 3 has `tempfile.TemporaryDirectory` available but Python 2 lacks
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this class so the message generation code uses `backports.tempfile` package
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bundled in the repository.
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The minimal Python versions are 2.7 and 3.4
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### Regenerate messages
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```bash
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cd src/device_trezor/trezor
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python tools/build_protob.py
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```
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The messages regeneration is done also automatically via cmake.
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[pyenv]: https://github.com/pyenv/pyenv
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