(Other posts on SO are similar, but none have the specific combination of uwsgi + Flask + virtualenv) (This one is closest)
I installed uwsgi via apt-get. I also tried pip install wsgi. Both gave me the same issue.
sudo uwsgi -s /tmp/uwsgi.sock -w myapp:app -H myvirtualenv
Python version: 2.7.4 (default, Apr 19, 2013, 18:35:44) [GCC 4.7.3]
Set PythonHome to myvirtualenv
ImportError: No module named site
See the answer from @JRajan first.
If you're sure you just want to suppress the error, mouseover below.
--no-siteto your command or
no-site=trueto your uwsgi.ini file.