pip install error (Python 3.5, VTK 7.0, MayaVi 4.4.4)

On a Linux box, I have VTK and all other Enthought dependencies installed, but `pip install mayavi` gives up with:

```
running install
running build
----------------------------------------------------------------------
Building TVTK classes... vtkContextDevice2D: Ignoring method: Get/SetViewportSize
default: [-406902224, 32519], range: None
vtkContextDevice2D: Ignoring method: Get/SetViewportRect
default: [-406902672, 32519, -258473880, 32519], range: None
vtkGeoTreeNode: Ignoring method: Get/SetStatus
default: 0, range: None
vtkIncrementalForceLayout: Ignoring method: Get/SetGravityPoint
default: [200.0, 200.0], range: None
error
Cleaning up...
Removing source in /tmp/pip-build-1e7_87oo/mayavi
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-1e7_87oo/mayavi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-in29tbm6-record/install-record.txt --single-version-externally-managed --compile" failed with error code -11 in /tmp/pip-build-1e7_87oo/mayavi/
```

The same thing happens when I try to install from a fresh Git clone instead of PyPI. From #384 I infer that this _should_ work, but I don't even have an indication of what has gone wrong.