Non Planar cmake error

[Ffestiniog]

Version

Trying to build Slic3r Non Planar version

Operating system type + version

Using Lubuntu 20.04LTS

Behavior

Problem is that cmake brings up an error when trying to build, attached photo of error

I have followed the instructions at www.github.com/DrEricEbert/Slic3r_NonPlanar_Slicing to the letter

Expected that it would complete without any errors

Actual result is an error as shown in the photo

Hope this is enough info

[Zip-o-mat]

You only need
perl Build.PL
and
perl Build.PL --gui

Please follow the instructions here: https://github.com/Zip-o-mat/Slic3r