Currently, Google App Engine recommends that users use "--target" to vendor packages: https://cloud.google.com/appengine/docs/python/tools/libraries27?hl=en#vendoring
Ostensibly we also support virtualenvs with only pure-python packages. > Alternatively, it should be possible to *detect* the problem cases, so > why not do that, and reject them? Effectively, reduce the scope of > --target to pure-python wheels only. This would be acceptable for the App Engine use case.
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