Compilation failed - UE4.23 preview with Chaos

Development World Creation
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Compilation error: ‘metahost.h’ not found.

I’ve been trying to compile the preview version for 4.23 from source (with Chaos enabled), and this error has been persistently occurring, looks like this is a quite common issue with the #include <metahost.h>
For me it was in the file SwarmInterface.cpp in \Engine\Source\Editor\SwarmInterface\Private\

I haven’t had any luck in solving this yet, first I redownloaded the repo and went through the setup process again, and the problem persisted.
Then I figured it might be as easy as adding the full path to the file (for me it is installed as a part of .NET SDK v4.6.2) so I tried it. That resulted in the following three errors:

E0147: declaration is incompatible with “NSwarm::FLogCategoryLogSwarmInterface NSwarm::LogSwarmInterface”

LNK1104 cannot open file ‘mscoree.lib’

MSB3075: The command “…\Build\BatchFiles\Build.bat -Target=“UE4Editor Win64 Development” -Target=“ShaderCompileWorker Win64 Development” -WaitMutex -FromMsBuild” exited with code 5. Please verify that you have sufficient rights to run this command.

I have no idea how to fix this, any suggestions?

2

spent the day struggling with this (in the new, official 4.23 release branch), then found the issue: the UE4 build tool is looking for .NET SDK v4.6.1 or v.4.6.

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Snag one of those components (by modifying your installation of VS in the Visual Studio Installer) and you should be all set to recompile - it solved my identical issue.

3

can you tell me, how you exactly solved this problem? When i install the .NET SDK v4.6.1 in VS the error remains

4

All I did was add the 4.6.1 SDK and the 4.6.1 targeting pack. Not sure which one solved - I also currently have the 4.6 targeting pack. (I probably have too many of those!)

5

I tried that and got the same errors as before. However, I will mark your answer as correct regardless. I will be updating this thread if I manage to solve it.

6

That didn’t solve my problem either.

7

not sure why it’s not working - fwiw I’ve successfully repro’d this solution on two other machines running VS2019. Good luck!

8

I had the same error, but with the VisualStudio 2017 version instead of 2019 it worked fine

9

I tried both the 2017 and 2019 version, no change.

10

I finally got it to compile, these are the steps:

  1. Download the source code from GitHub as a ZIP archive file instead of using Git clone

  2. Unpack the ZIP, run Setup.bat, then GenerateProjectFiles.bat

  3. Open the solution (.sln) file in Visual Studio 2019

  4. Right-click on the project you’re trying to build (UE4), select properties, then navigate to “VC++ Directories”

  5. Find the options “Include directories” and “Library directories”, change both to “Inherit from parent or project defaults”

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  1. Apply and build (rebuild to be safe)

This fixed all of my original problems, check the other answers on this thread if this does not work for you.

TL;DR: Download the source code as ZIP instead of using Git clone, check your VC++ Directories in VS.

1 Like
11

This worked for me.