First time setup

Im following this guide to install the unreal engine in mint cinnamon

Manage to finish the ./ part, but when i type $ ./ it gives me this error “Please run Setup to download dependencies before generating project files.”
So i run the ./ again and it gives me this

Registering git hooks… (this will override existing ones!)
dpkg-query: no packages found matching clang-3.9
Attempting installation of missing package: clang-3.9

  • sudo apt-get install -y clang-3.9
    Reading package lists… Done
    Building dependency tree
    Reading state information… Done
    E: Unable to locate package clang-3.9
    E: Couldn’t find any package by glob ‘clang-3.9’
    E: Couldn’t find any package by regex ‘clang-3.9’

So, what should i do?