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This is similar to where I got stuck yesterday

Thanks but I’m trying to understand the mechanics of calling into native libraries.

Looks like your problem is due to a default behavior of cinterop. By default it doesn't generate stubs for declarations already existing in the platform libs. In your case the `sin` function is already included into `platform.posix` so cinterop doesn't include it into your library. You may use the `-nodefaultlibs` flag of cinterop to change this behavior and generate stubs for all declarations. In this case you should see a long list of functions in the `klib contents` output instead of just package names.