Building legacy PySide 1.2 for new versions of Python

Recently, I found myself in a situation where I needed to use the good old PySide 1.2, which, unfortunately, doesn't appear to be maintained anymore, and I didn't want to use a deprecated version of Python. Building it in a recent environment is not quite as simple as a pip install, but it's not that hard, either. Read on to find out how to go about it.

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