Arch Linux

Install python-flask, open a python shell:

>>> import flask
>>> print(flask.__version__)
0.12.2-dev

Meanwhile, create a virtualenv, pip install flask, open a python shell:

>>> import flask
>>> print(flask.__version__)
0.12.2

This is partially our (Flask's) fault, something in our release script tags the wrong commit as the release on Git. However, PyPI has the correct files. Distros should be using PyPI's sdist builds for packaging. https://pypi.python.org/pypi/Flask

I'm not familiar with Arch PKGBUILD workflow, but it looks like it's easy to link to a GitHub version archive. Unfortunately, PyPI downloads are impossible to predict the links for. If you can use an alternate download method, `pip download --no-deps --no-binary :all: flask` will get the sdist from PyPI.