Why is my previously successful Chaco build suddenly failing w/ Qt4 vs. Qt5 error?

Question

A previously (several years ago) successful conda build ... of Chaco v5.0.0 is now failing with:

RuntimeError: Importing from qt4 backend after selecting qt5 backend!

What have I broken and how do I fix it?

Answer 1

D'oh! I had the ETS_TOOLKIT environment variable set to: "qt5". Sorry. :(