Geant4 installation error

Hello, hope you are doing well!
I am using this link to install geant4 10.6 on ubuntu 19.10
When i wrote command
Error appeared(screenshot attached).
Any help would really be appreciable.
Thanks for your time and consideration.!
Screenshot from 2020-04-19 06-54-22|690x387

Remove the \ after cmake. It’s the escape character so is assuming you want to run the command “cmake -DCMAKE…” not cmake. Our official install guide is here: