(txscada)[12:44:23] defo:pysmve git:(master*) $ which python
/home/defo/.virtualenvs/txscada/bin/python
(txscada)[12:44:29] defo:pysmve git:(master*) $ pip install Construct
Downloading/unpacking Construct
  Running setup.py egg_info for package Construct

Installing collected packages: Construct
  Running setup.py install for Construct
    error: could not create '/usr/lib/python2.7/site-packages/construct': Permission denied
    Complete output from command /usr/bin/python2.7 -c "import setuptools;__file__='/home/defo/.virtualenvs/txscada/build/Construct/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-21yutH-record/install-record.txt --install-headers /home/defo/.virtualenvs/txscada/include/site/python2.7:
    running install

running build

running build_py

running install_lib

creating /usr/lib/python2.7/site-packages/construct

error: could not create '/usr/lib/python2.7/site-packages/construct': Permission denied

----------------------------------------
Command /usr/bin/python2.7 -c "import setuptools;__file__='/home/defo/.virtualenvs/txscada/build/Construct/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-21yutH-record/install-record.txt --install-headers /home/defo/.virtualenvs/txscada/include/site/python2.7 failed with error code 1 in /home/defo/.virtualenvs/txscada/build/Construct
Storing complete log in /home/defo/.pip/pip.log