When calling python3.5 setup.py using sh.py, the setup can fail because the spawned process doesn't correctly set the locale to use UTF-8.

In the case of plyer, a changelog is read during setup that contains non-ascii symbols. Without correct locale, the python interpreter will try to decode the file upon open('changelog.md') using ascii codec and raise an exception.

Setting the LANG enviroment variable to system locale solves the issue.

class PlyerRecipe(PythonRecipe):
    version = '1.2.5dev'
    url = 'https://github.com/emillynge/plyer/archive/browser.tar.gz'
    depends = ['pyjnius', 'python3crystax']

    def get_recipe_env(self, *args, **kwargs):
        env = super().get_recipe_env(*args, **kwargs)
        env['LANG'] = "en_GB.UTF-8"
        return env

Maybe this environment variable should be set by default by PythonRecipe?

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