The current build system can generate umk binary alone (make umk -j8).

Then theide could be build using umk to speed the process.

It know that this works on Linux because I tested a modified "domake" script doing just this in February 2017 (still on my computer). I didn't investigate further for other OS.

My main issue was: umk uses $HOME/umk/_out . This is incompatible with rpm based distro (and sandboxed compilation as on Debian I think).

edit: and now umk or umks create ~/.upp/umk/... ~/.upp/umks/... and this is still incompatible with binary package building in most Linux distributions.