Which version of LESS is supported?

[celwell]

Specifically do you know if this LESS update is included in the current version of less4j?

If you are using the semantic-ui-less package with versions of LESS before 3.5 some calc values will not be computed correctly due to changes in variable interpolation. It is recommended that you upgrade to at least 3.5 to continue using new versions of SUI.

https://github.com/Semantic-Org/Semantic-UI/blob/master/RELEASE-NOTES.md#version-241---oct-13-2018