julia> Pkg.add("IUP")
ERROR (unhandled task failure): unknown package IUP
in error at error.jl:19
in anonymous at task.jl:47
ERROR: unknown package IUP
in wait at task.jl:57
in sync_end at ./task.jl:331
in add at pkg/entry.jl:339
in add at pkg/entry.jl:71
in anonymous at pkg/dir.jl:28
in cd at ./file.jl:20
in cd at pkg/dir.jl:28
in add at pkg.jl:21
on 6bf81b3