You want kdesrc-build for that. Installing it is not really easy, there should be a package at least on KDE Neon repos.
Thanks, I may try it sometime. I have a Neon installation in one of my partitions already.
Using Gentoo might work if you enable the KDE overlay: https://wiki.gentoo.org/wiki/KDE/Ebuild_repository
Gentoo supports slots; which allows for concurrent installations of things like desktop environments. Not sure if it's configured that way right now though.
If you use BTRFS you could install gentoo on a subvolume and boot into it when needed too.
@arran4 @voracread With some specific packages there are conflicts between different versions, so you can only have one at a time installed even if they have different slots. I think a few of the core KDE packages are like that. I know that I had to remove some parts of KDE 5 when I installed KDE 6 on my Gentoo system.
I've only recently moved back but I was using it before the KDE4 release and you could do it with 3.x. Shame
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