UE compile failures on latest nix

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Hello, Im a artist that works in both film and games. I need UE5 to work. ive moved over to nix as ive seen some awesome things, and i really love the way its immutable and can shift from hardware to hardware.

My issue is that, i cannot get UE5 to compile. when i get to the run the “./Setup.sh” im presented with errors from bash. Specifically “bash: ./Setup.sh: cannot executte required file not found”

I have mono installed "the version that was availble to nix-env -i mono
then i install clang again with nix-env -i clang
then i pulled the repo and ran the Setup.sh

i cannot get past this issue. Im looking forward to working with this os, its very promising and this so far is the only issue i have come across beside a few hardware issues (mostly solved)

If any one could help me get ue5 compiled and running i would be extremely greatful. Thank you in advanced

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Is Setup.sh starting with #!/bin/bash ?

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Installing development dependencies using nix-env is not supported. Use nix-shell instead. See also I installed a library but my compiler is not finding it. Why?

As for the Setup.sh error, NixOS intentionally does not have /bin/bash (recently discussed in Shebang locations) so you will need to replace this line with #!/usr/bin/env bash.

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thank you i will try these tonight and see how i go with it. Thank you fo r the links, they will be helpful. If i run into any issues i dont understand ill update the same thread in case any one else has the same issues later on.

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I’d love to know if you managed to get UE5 to compile.

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I’ve got it to at least link appropriately. Here’s what I did, not sure if using steam-run is all I needed to do, but I did all three of the following in this thread

https://www.reddit.com/r/NixOS/comments/17kwkgv/switched_from_nobara_to_nixos_my_opinion_so_far/

Unreal Engine and Godot Engine needed nix-ld setup + envfhs (not sure if the name is right) Or sometimes steam-run is good enough, but I am used to running them without other stuff, so added the required libraries in nix-ld

So I blindly copied from here:

This configuration.nix setup:


  programs.nix-ld.enable = true;
  programs.nix-ld.libraries = with pkgs; [
    stdenv.cc.cc
    bash
    zlib
    fuse3
    icu
    zlib
    nss
    openssl
    curl
    expat
    envfs
  ];

  environment.systemPackages = with pkgs; [
    nix-ld
    git
    envfs
  ];

At this point, running ./Setup.sh still wasn’t working, I then tried steam-run ./Setup.sh and it worked. The write up in the blog post mostly explains how Nix links things differently, and how steam-run can be used to get around binary linking issues. I think nix-ld can help turn that into a configuration. I suspect steam-run is all I needed to do, but it’s running now at least

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