Minimum dev environment for plugins...

[dgud]

Yeah a erl 16 is way old (3 years), so you need a newer version of that.
We promise to run code from releases back, i.e. erl 17 would be the latest compiler that generates
code to run on erl 19 which wings uses.

The only thing missing to be able build the complete wings is cl library found at
https://github.com/tonyrog/cl (we only need header file really to be able compile wings) though opencl will not work if not compiled.