On Tue, Jan 31, 2017 at 09:18:10 +0000, andrew2hart . wrote: > Is there a recommended way to build VTK-7.1.0 with both python 2 and python > 3 wrappers? You need to build it twice. The build does not support using more than one Python library at a time (even 2.6 vs. 2.7). --Ben