Thanks, Ken,
These extensions built without any issues on my sandbox server and I've been watching the powa web page for some time. I thought I could copy the extensions over to another system and have the powa database on that system have those extensions created. Some further research on my part has revealed that the files needed in /usr/pgsql-9.4/lib for these extensions didn't get copied over (someone else wrote the script, sigh...) So, I think that may be the problem. What I now don't understand is how did the powa extension get created as that one also has a lib.so which isn't present, yet the create extension succeeded for that one.