So, I've been the maintainer of https://aur.archlinux.org/packages/tcloo/ for a while now, I don't even actually remember how or why I ended up maintaining this... anyways, with the release of tcl8.6 it no longer builds properly and I just don't have the time to dedicate to it to get it back to a functional state. If anyone is interested, feel free to let me know and I'll disown it for whomever wants to give this the tender loving care it needs.