vtkpython as project interpreter in pycharm?

VTK has good Python support. On my Mac Book Pro, it builds a variant of Apple's preinstalled version of 2.7.10 and installs the variant in /usr/local/bin. The variant is named "vtkpython." I'd like to use it as a project interpreter in PyCharm, but PyCharm won't let me select or add  /usr/local/bin/vtkpython as a project interpreter. PyCharm complains that it's ~"not a suitable home for a Python SDK."~ I'd be grateful for advice, even a workaround. Would changing the name from vtkpython to python do the trick?