How to Build Unreal Engine from Source

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In this video, we go over how to build Unreal Engine from its source code on Epic Games' github. We go over everything from connecting your Github account to your Epic Games account, using Git to download the source code, installing .Net frameworks and packages, building Unreal Engine in Visual Studio, and making sure everything works as it should.

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Song: Lakey Inspired - Chill Day
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0:00 Intro
1:13 Connecting Epic Games & Github accounts
2:27 Downloading Unreal Engine source
6:25 Building Unreal Engine source
8:23 Running a project in Unreal Engine source
#ue4 #unrealengine #sourcecode

[AdamFBuchanan]

30seconds into this video and a already felt I understood more than reading a whole git hub doc about how to do this. Thanks ❤️🤟

[Cloroqx]

If you get a GenerateProjectFiles error, install MSBuild via the Visual Studio 2019 installer (you can choose modify if you have already installed it). Cheers.

[ramdoula]

u are a life saver, for those who get compiler errors, know that if your pc shutdown in the middle of the process that might be the reason why (delete binaries saved and intermediate this is safe and will be rebuilt by the process shown in the video) thanks flopperam <3

[FrancoSciaraffia]

1:00 You can also see engine source code in launcher download, you just can't edit it.

[Flopperam]

Very small typo at 5:54 in the subtitle at the bottom. It should say "without" instead of "with out".
Also, whenever Unreal Engine updates, just do a "git pull origin <name-of-branch>" in command prompt to get the latest version of the branch you're on and rebuild after running Setup.bat and GenerateProjectFiles.bat again.

[Flopperam]

At 6:33, people have told me that with newer versions of Unreal Engine, you may have to install the "Desktop Development with C++" and "Universal Windows Platform development" workloads instead of installing multiple individual components separately. Those workloads may include extra components that you don't need, but they will make sure that everything you do need is installed. And you may also need to install the "C++ (v142) Universal windows platform tools" individual component separately, but I'm not 100% about this because the two additional workloads might be enough.

[Flopperam]

We apologize for not pointing this out in the video but after connecting your Epic Games account to your Github account, you have to check your email for a confirmation link to finish the connection process. Otherwise, you will still not be able to see private repositories on the Epic Games Github page.

[greatideas]

So many plugins seem to be incompatible with the source build version of UE. Would I have to always place the plugin and rebuild the engine time and time again? It literally took me half the day just to build the engine. Would their be a faster method to get any new plugin I find to be compatible with the source build?
Does 8:59 (building a project file) take a long time to compared to the initial building of the engine?

[Nothingreallyexists]

Your video is extremely clear and concise, but because of this, you should consider updating it every two years or so. Some of the nuance changes, some of the update #'s change. Of course in principal its all about the same, but your tut is golden!!

[oreidi]

why its says me ERROR: UnrealBuildTool Exception: Unable to open log file for writing in 7:49

[akaez]

well done exactly what I was looking for
love it

[kinggore]

It took ages to build it...
Literally ages...

[george_]

0:50 You can actually get the debug symbols with an installed version. Though obviously it's not as useful.

[ramdwivedi]

Unable to find a valid installation of Visual Studio. Please check that you have Visual Studio 2017 or Visual Studio 2019 installed, and the MSBuild component is selected as part of your installation.

[WizardCell]

Really useful, thanks buddy for the tutorial

[digimikeh]

hi!.. why did you checkout 4.20 is this not an older version?... thanks for the tutorial. ( min 6:00 )

[SenEmChannel]

Stuck at 2:30. The link you give is broken. I double check every step and it still doesnt work

[jaychang]

Hello, i just build the Engine by following this video, but when i packaging for windows, the engine can't find my Visual Studio 2017, can u help me? Thanks

[harunlikcelik]

When we compile project with github version engine, it also compile engine source code. How can we prevent that?

[polar]

Hey, this is unrelated but at least on the launcher version of unreal engine, it runs at a steady 20-30 fps. sometimes it will just freeze and it is not when I do something specific it's when I do anything, even If I leave it to run and don't touch it please help