Another gem (or at least gem-oid).
If you use strings to signify system names in ASDF system definitions, it works just fine. However, it seems as if it interacts weirdly with at least some versions of ASDF- INSTALL.
Due to that, I will be going through my packages and slowly update them to use #:systemname instead of "systemname". On the whole, there won't be much ele updated, though.