I built a project for Linux. Where's libopenal.so?

I’m trying to build a project for Linux ARM. Yesterday I managed to download UE4 source code and build it so I can package my projects for Linux ARM.

I opened the 2DSidescrollerExample and built it for Linux. Once finished (successfully), I went to the wiki’s (A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums) final step (“Additional Step for Linux-ARM platforms”).

I’m supposed to replace libopenal.so, located at \LinuxNoEditor\Engine\Binaries\Linux, but on that path there’s only one file called “UE4Game-Linux-Shipping”.

Where’s that libopenal.so sfile I should replace? Is it not needed anymore?