Build Unreal Engine 5 on Linux

build-ue5-linux.md

1. Clone repo (or sync with git pull if already cloned):

git clone https://github.com/EpicGames/UnrealEngine

2. Run setup script:

./Setup.sh

3. Run project file generation script:

./GenerateProjectFiles.sh

If you get the error

Setting up bundled DotNet SDK
Process terminated. Couldn't find a valid ICU package installed on the system. Set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support.
...
GenerateProjectFiles ERROR: Failed to build UnrealBuildTool

try setting environment variable DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1, or installing ICU v50 (courtesy of @debian-user-france1).

4. Finally, run the build:

make

You forgot to add the export (export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1)

No, I did not. The instruction is to set the environment variable, not a command. You can set the env var inline (i.e. DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1 ./GenerateProjectFiles.sh, export to the shell's global environment (i.e. export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1 && ./GenerateProjectFiles.sh), or any other method of setting the env var.

One thing though.. It's possible to install a package which will solve the error too. On Arch you'd do that: yay -S libicu50.

Thanks! Noted in the doc.

I can't find anything similar on Gentoo. Is icu50 on AUR literally version 50 from April 2019??

The following icu versions are in the AUR:

icu               icu56             icu63             icu68-bin       
icu4j             icu57             icu64             icu69           
icu50             icu58             icu65             icu69-bin       
icu51             icu59             icu66             icu70           
icu52             icu60             icu67             icu-git         
icu55             icu61             icu67-bin         icu-git-static  
icu55-staticlibs  icu62             icu68             icu-staticlibs

If not then it's from the Arch/Manjaro repository.