https://github.com/dlang/dub/issues/658

As noted in the above issue, dub runs in the root project directory for all packages, including dependancies. So if any project aside from the root project includes a relative path in it's dub.json, that dub build will break, due to the incorrect working directory. I can't even use $PACKAGE_DIR to fix this because it doesn't work half the time (invalid identifier).

How do people deal with this?