If you are trying to install Semantic UI into your Angular 6 projects you may get the following error
Error: less version 3.8.1 is not currently supported
This is an error I have seem come up tie and time again, and is a very simple error to overcome.
To resolve this issue all you have to do is run the following command in your angular 6 project.
npm install firstname.lastname@example.org --save-dev
This will resolve the issue for installing Semantic UI via Gulp, hopefully v3 will be supported in the near future.