/Users/fkuehne/Desktop/videolan/gits/VLCKit/libvlc/vlc/modules/audio_output/audiounit_ios.m:170:37: error: incomplete definition of
      type 'struct aout_sys_t'
            vlc_tick_from_sec([p_sys->avInstance outputLatency]);
                               ~~~~~^
/Users/fkuehne/Desktop/videolan/gits/VLCKit/libvlc/vlc/include/vlc_tick.h:80:42: note: expanded from macro 'vlc_tick_from_sec'
#define vlc_tick_from_sec(sec) _Generic((sec), \
                                         ^~~
/Users/fkuehne/Desktop/videolan/gits/VLCKit/libvlc/vlc/modules/audio_output/audiounit_ios.m:157:12: note: forward declaration of
      'struct aout_sys_t'
    struct aout_sys_t *p_sys = p_aout->sys;
           ^
1 error generated.