The latest 232-1.9.20-RC-release-459-IJ9559.62 Kotlin IDE plugin seems to have broken cinterop references in the IDE. Both references for dependencies from CocoaPods as well as a local C library with a manual .def file show "Unresolved reference" errors in the IDE now, while everything compiles fine. It does this for both 1.9.20-Beta2 and 1.9.20-RC. The references are detected with 1.9.10. Previously, with the 1.9.20-Beta IDE plugin, I did not notice these errors.