I'm trying to set up a Rails 2.2.2 installation (for an old app that I maintain) in a new Linux Mint 18 install.I've installed mysql (5.7.16-0ubuntu0.16.04.1 (Ubuntu)) and, using RVM, have installed the same mysql gems that I have in my old Linux Mint 13 install (which i still have up and running on a seperate partition on the same computer).  The gems are:mysql (2.7)mysqlplus (0.1.2)When I try to start rails I get this error:irb: symbol lookup error: /home/max/.rvm/gems/ruby-1.8.6-p420@elearning-resource/gems/mysqlplus-0.1.2/lib/mysql.so: undefined symbol: vio_blockingI don't know what mysql.so is: it's a binary of some sort.I've never seen this error before - can anyone help?thanks, Max
mysql.so: undefined symbol: vio_blocking
linux mint;mysql;ruby;rails