UE5 fails to build on Arch Linux, ISPC errors

[breslin-studios]

this was solved here among other places:

Fix for ISPC Error When Building Unreal Engine 5.5 on Linux

Hey folks! Just wanted to share a quick fix that saved me a ton of time while building Unreal Engine from source on Linux. I was running into a super annoying ISPC-related error during the engine build process. I saw lots of forum posts and GitHub issues, but most of them were about compiling game projects — not the engine itself. So it took a while to figure out the right solution. After digging through some of the build files, I found the culprit. The fix was surprisingly simp…