Hi Martin -
Thanks much for the response... I actually got it working and I think part of my issues was I grabbed a beta version of the GWE instead of "latest".
I was trying to install MuranoCLI on Mac OSX High Sierra. A couple of google searches led me that I needed to install "Xcode" on my Mac in order to have some required libs/header files available. I did run into a couple of issues once I got MuranoCLI installed... namely getting "syncup" to work. I had to use a workaround and created a symlink ~/code/specs ~/code/gateway-engine/specs. Following the directions as written did not work and I got errors executing syncup when I modified location.base.
I'm no developer and I'm slogging through this as part of a PoC... are you aware of any sample GWE app that I could use with the GWE running on a RPi?