# I have an issue on building Unreal Engine 4 with Mac OS X **URL:** \ **Category:** Platform & Builds\ **Tags:** Macos, build, unreal-engine, UE4, question\ **Created:** [June 8, 2020, 5:47pm UTC](https://forums.unrealengine.com/t/i-have-an-issue-on-building-unreal-engine-4-with-mac-os-x/466405 "2020-06-08T17:47:04Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![anonymous\_user\_d228347b](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_d228347b](https://forums.unrealengine.com/u/anonymous_user_d228347b)\ **Post date:** [June 8, 2020, 5:47pm UTC](https://forums.unrealengine.com/t/i-have-an-issue-on-building-unreal-engine-4-with-mac-os-x/466405/1 "2020-06-08T17:47:04Z")
I use macOS Catalina 10.15.4. I am trying to build up airsim with Unreal Engine 4 according to this page. [Build on Linux - AirSim](https://microsoft.github.io/AirSim/build_linux/) ./Setup.sh is no problem, but ./GenerateProjectFiles.sh is doesn’t work. The output is below. $ ./GenerateProjectFiles.sh Setting up Unreal Engine 4 project files… Running bundled mono, version: Mono JIT compiler version 5.16.0.220 (2018-06/bb3ae37d71a Fri Nov 16 17:12:11 EST 2018) 2020-06-08 16:36:51.454 defaults[19179:9679282] The domain/default pair of (com.epicgames.ue4, MonoAOT) does not exist Generating data for project indexing… 100% Writing project files… 100% $ The process seems to be on its way out. The makefile doesn’t been produced. Please tell me how fix it. Where can I get com.epicgames.ue4 and MonoAOT from? ---
**Author:** ![wasimbashir](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@wasimbashir](https://forums.unrealengine.com/u/wasimbashir)\ **Post date:** [July 30, 2025, 11:06am UTC](https://forums.unrealengine.com/t/i-have-an-issue-on-building-unreal-engine-4-with-mac-os-x/466405/2 "2025-07-30T11:06:04Z")
i am having the same issue did you find how to solve it ?