Missing files when building from source

I’ve built UE 5.1 from github source and just noticed that I’m missing some executables such as UnrealPak.exe which should be under \Engine\Binaries\Win64. The build log shows no errors:

========== Build: 8 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

The \Engine\Source\Programs\UnrealPak folder is present. As far as I can tell no source files are missing.

a) Why did UnrealPak.exe not get built along with the rest of the project?

b) How can I build UnrealPak along with everything else that’s missing?