Unity 5.2.1f1 IL2CPP iOS: missing header files

Hi,

when building our project for il2cpp iOS, the resulting XCode project does not compile.
il2CppAttributes.cpp tries to #include "MFMLibrary_MFMLibrary_(bla_bla_bla)_gen_35.h" through "...gen_40.h" which do not exist. There are such files for "..._gen_1.h" through "...gen_34.h" however.

MFMLibrary is an assembly we build externally (outside of Unity) and put in the Assets/Plugins folder.

We are able to build the same project (excluding the Unity 5 migration) successfully for Unity...

Unity 5.2.1f1 IL2CPP iOS: missing header files