Import SIP error when using homebrew QGIS

[pat-s]

Any RQGIS call returns

Traceback (most recent call last):
  File "py_cmd.py", line 3, in <module>
    from qgis.core import *
  File "/usr/local/Cellar/qgis2/2.18.3/QGIS.app/Contents/Resources/python/qgis/__init__.py", line 26, in <module>
    from qgis.PyQt import QtCore
  File "/usr/local/Cellar/qgis2/2.18.3/QGIS.app/Contents/Resources/python/qgis/PyQt/QtCore.py", line 26, in <module>
    import sip
ImportError: No module named sip

Related:

• http://stackoverflow.com/questions/30004778/no-module-named-sip-when-running-qgis-from-python

• http://gis.stackexchange.com/questions/150767/importerror-no-module-named-sip

• http://gis.stackexchange.com/questions/144908/can-we-avoid-using-sip-library-when-writing-standalone-qgis-python-script

SIP is not found by /usr/bin/python. Using my default homebrew python, SIP is found but I get

>>> from qgis.core import *
Segmentation fault: 11

@rkrug Are you getting the same error message?