Thanks for the instructions. I installed ThingSpeak to a Raspberry Pi 3 running the latest version of Raspbian Jessie (May 2016, v4.4, full desktop version). The only issue was 'bundle' needed to be installed as well, which I did at the time of ThingSpeak Server install. Does 'bundle' need to be added to this step?
INSTALL Required packages
*sudo apt-get -y install build-essential git mysql-server mysql-client libmysqlclient-dev libxml2-dev libxslt-dev libssl-dev libsqlite3-dev *