Can't flymake on underscore files?

[justinabrahms]

In my project's scss files, most work is done in underscore files (eg _landing.scss). These are included in such a way that variables are defined at compilation (eg $dark-blue) that aren't defined in the file itself. Is there a way to enable flymake support in such a way I can see linting errors but don't require those variables to be defined in the file itself? Defining an entrypoint file or similar, perhaps?