I completely forgot some notes I took when I tested the install on a RPi 
last time, just found them now:

1. install Raspbian
> 2. install requirements: apt-get install libjpeg-dev libtiff5-dev 
> zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev libharfbuzz-dev 
> libfribidi-dev tcl8.6-dev tk8.6-dev python-tk
> 3. copy requirements.txt, weewx.tar.gz and ws3000*.py to the RPi
> wget https://bootstrap.pypa.io/get-pip.py
> python get-pip.py
> pip install -r requirements.txt


So to update pip on your system, you can use:
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py


Then try again to install the missing python requirements, and most 
importantly, update pyusb.

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