"Unable to open libLLVM!" error trying to create_sysimage in 1.8.0

Perhaps you could see if @CarloLucibello 's branch works for you:

https://github.com/oxinabox/DataDeps.jl/pull/159

https://github.com/CarloLucibello/DataDeps.jl/tree/cl/bb

using Pkg
pkg"add https://github.com/CarloLucibello/DataDeps.jl#cl/bb"