Installing Greta in Centos

I’ve followed the “Robust instructions as of March 31, 2019” posted here on a Centos7 server, but am not having success.

In a nutshell, it’s a Groundhog Day situation:

> library(greta)

greta requires TensorFlow (>=1.10.0) and Tensorflow Probability (>=0.3.0), but TensorFlow isn't installed and TensorFlow Probability isn't installed.

Running

install_tensorflow(extra_packages = "tensorflow-probability")

then runs, but neither TF nor TFP are being recognized as installed. Of course the step above should not be needed as these were already installed into the r-tensorflow Conda environment.

Ideas, suggestions? The same instructions work perfectly on OSX