Requirement already satisfied (use --upgrade to upgrade): buildstream in /home/sam/buildstream
Requirement already satisfied (use --upgrade to upgrade): setuptools in /usr/lib/python3.5/site-packages (from buildstream)
Requirement already satisfied (use --upgrade to upgrade): psutil in /home/sam/.local/lib/python3.5/site-packages (from buildstream)
Requirement already satisfied (use --upgrade to upgrade): ruamel.yaml in /home/sam/.local/lib/python3.5/site-packages (from buildstream)
Requirement already satisfied (use --upgrade to upgrade): pluginbase in /home/sam/.local/lib/python3.5/site-packages/pluginbase-0.5-py3.5.egg (from buildstream)
Requirement already satisfied (use --upgrade to upgrade): Click in /home/sam/.local/lib/python3.5/site-packages (from buildstream)
Requirement already satisfied (use --upgrade to upgrade): blessings in /home/sam/.local/lib/python3.5/site-packages (from buildstream)
You are using pip version 8.0.2, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Exception ignored in: <function WeakValueDictionary.__init__.<locals>.remove at 0x7fe4165d0378>
Traceback (most recent call last):
  File "/usr/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable