Adding frameworks to the Plugin Inspector?

I've installed Unity 5 and am updating some projects that use multiple-platform native plugins, which seems to be working pretty well. One plugin (.a file), however, requires CoreAudioKit.framework fir iOS8 which is not included in the list of frameworks in 'Framework dependencies', 'Default frameworks', or 'Rarely used frameworks'.

Is there a way to add frameworks to these lists? I took a look inside the Unity application package, but nothing obvious popped out. I also experimented with adding '-framework CoreAudioKit' to the 'Compile flags' box without much success.