UE4 taking too much disk space

Hello, I wanted to install UE4 and Airsim on ubuntu 16.04. I have 70gb free on my partition. When I download and do ‘/setup’ and ‘/generateProjects’ it usually takes up 40gb of data (more or less) and when I do ‘make’ I run out of space on my PC. The folder UE has all 70gb and it is on compile number 420 out of 2230… Is this normal? From what I’ve seen UE4 only needs 10-15gb of space. Am I doing something wrong? I’m following the tutorial: Build on Linux - AirSim

Ok ok! I will do that! Thank you very much!