Found them. Here they are...
Install the latest Rasbian OS for your Raspberry Pi. Then go to the Raspberry Pi Configuration and configure the Localisaton tab. Be sure to set the Character Set: to ISO-8859-1
Use the browser to download the latest CHIRP daily tarball. Today it is: chirp-daily-20170501.tar.gz
In terminal, execute the following commands...
sudo apt-get install python-dev python-libxml2 sudo usermod -aG dialout pi cd ~/Downloads tar xzf chirp-daily-20170501.tar.gz mv chirp-daily-20170501 ~/chirp cd ~/chirp
From here you can run CHIRP by using the following command:
./chirpw
Once you've tested CHIRP and it runs OK on your Raspberry Pi, you can install it with this this command:
sudo python setup.py install
This should cause an "Other" entry containing CHIRP in the Main Menu but I had to fiddle around with the Main Menu Editor to get the "Other" entry to appear.