My RTLSDR USB dongle finally arrived. It took about a month to order from China. It's about $50 if you order it in the US, but only $15 if you order from China, but you pay a time cost.

GNU Radio is building, but CocoaRadio is working well.

The plan is to get it up and running and use it to work with the wireless security system and monitors I already have. Eventually, I'd like to have temperature monitors all over the house and have an intelligent HVAC control that can take the temperatures into account.

In order to get ports working I had to update Xcode. "sudo xcode-select –install" then "sudo xcodebuild –license". (Which may not be necessary) Before running a "sudo port selfupdate" and "sudo port upgrades".