How to pass -rpath=$ORIGIN to the linker via dub?

[via Digitalmars-d-learn]

I'm looking to manage my current project with dub, but there is 
one problem that has been getting in my way. I want to use 
`-rpath=$ORIGIN`, which I can pass with `-L-rpath=\$ORIGIN` when 
directly invoking the compiler, but when putting `-rpath=$ORIGIN` 
or `-rpath=\$ORIGIN` in "lflags," dub complains - "Error 
executing command build: Invalid variable: ORIGIN."

I am unsure of what I am missing; any help would be greatly 
appreciated :)