Unreal Engine 4 on Gentoo [SOLVED]

atemv · n00b Joined: 09 Aug 2014 Posts: 63

Hello everyone,

The Unreal Engine 4 source code is accessible, it supports Linux, and it moves

https://github.com/EpicGames/UnrealEngine.git (IMPORTANT: You need a Unreal Engine account linked to your github account to get the source)

The goal of this post is to start a discussion, how to build a properly working Unreal Engine 4 with it's essential components for creation.
I have not written "game creation", because modern game engines are capable for many other tasks like physical simulations, VJ projection, architectural or any other visualization... well I guess the fantasy of the user is the bottle neck.
So it should be nice to workout a method to build and run a properly working UE4 engine for Gentoo, and document it on the wiki.

What I found so far:

There is a fairly good tutorial how to build it on Linux:

https://wiki.unrealengine.com/Building_On_Linux

However following this tutorial, I ran into two major issues. The first is Nvidia proprietary driver specific, what was not too hard to workaround.
The second is Gentoo specific, and much more complicated.

1. Issue:
Scenario: I use a Nvidia card with proprietary driver with 3 screens separated to 2 X screens with a need for a feature to drag one window from one X screen to another.
Problem: According my recent knowledge (what can be wrong) for the drag window to other X screen feature to work, the Nvidia proprietary driver requires Xinerama turned on,
however it prevents XRandR extension to load, and without it you will get this error message when try to run the UE4Editor:

atemv · n00b Joined: 09 Aug 2014 Posts: 63

Chiitoo · Posted: Wed Oct 14, 2015 9:38 am Post subject: ><)))°€

Thank you for posting about this here!

I don't know if I would have bumped into the fact of the source being available like this otherwise, even though I was actually looking into the UE4 recently. Due to the no Linux builds business, it wasn't happening, not to mention the non-free side of things. Not that it's really free now either, but at least now I'll get to mess with it a bit!

I didn't actually fully read your post until after I had successfully built things myself. I went for the release branch first, then 4.10, then 4.9, but I was having build issues with them all. The build system wasn't telling me what was wrong, but I decided to try downgrading clang from 3.7.0-r100 to 3.5.2-r100, which seemed to do the trick.

Then I was getting the same SDL_Error as mentioned here. I also found out about the hacking of glibc, but I didn't feel like doing that. I still managed to run the editor, however, like so:

atemv · n00b Joined: 09 Aug 2014 Posts: 63

For me the UE4Editor is working flawlessly. Can you post some debug information?

NeddySeagoon · Posted: Wed Oct 14, 2015 7:23 pm Post subject:

Moved from Portage & Programming to Unsupported Software.
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Chiitoo · Posted: Thu Oct 15, 2015 2:41 pm Post subject:

atemv · n00b Joined: 09 Aug 2014 Posts: 63

I also use the newest mono from the gentoo overlay:

Bloss · n00b Joined: 05 Dec 2014 Posts: 20 Location: MI, USA

Maybe it would be ideal to setup a chroot, or a container?

Rebuilding glibc sounds terrible.

sbbg · n00b Joined: 02 Feb 2013 Posts: 23

I just built it with current Gentoo environment and found that the workaround is no longer required.
Anyone has interest in making ebuild for this? :oops:

Hu · Moderator Joined: 06 Mar 2007 Posts: 21631

If the build procedure is simple to describe, it is simple to codify in an ebuild. Please describe what steps you took, starting from downloading the source archive (and where to get it). Someone should be able to help you write an ebuild that does those steps for you.