warning C4275: non dll-interface class 'EffectHostInterface'

srceffects/Effect.h(66): warning C4275: non dll-interface class 'EffectHostInterface' used as base for dll-interface class 'Effect'
          SVNincludeaudacity/EffectInterface.h(83) : see declaration of 'EffectHostInterface'
          svnsrceffects/Effect.h(65) : see declaration of 'Effect'

Those are just the warnings I’ve encountered too.
Caused by the Realtime Effects implementation I suppose?