I am wondering what the proper way to deal with external non-D
dependencies is. For example, libd-llvm uses a lot of libraries from
LLVM whose library path changes from machine to machine, and some of
the list of 30 libraries changes as well. They have a nice
configuration tool llvm-config which emits ldflags which are very nice
to use from makefiles but I don't see any way to obtain this
information from within the dub.json.

Do I essentially need to make an autotools-esque script to generate the
dub.json? That seems to be at odds with the ability to register
packages.

-S