UE4Editor crashes on startup

Hello.
I’m trying to use the Unreal Engine 4 Editor under Archlinux, but after building (and some troubleshooting) the app crashes with this error after it completes the startup process (the splash screen is shown, reaches 100%, but i can’t go to the actual editor)
Here’s the full log: Error - Pastebin.com
I compiled the engine manually from the git branch a month ago or so.
In case it’s needed, i’m using an i7 6700K with a RX 580.
I’m available for any further investigation/log posting/check for my setup, i’m pretty sure i did something wrong but i can’t pinpoint what i’ve done wrong.