=========================================videodevs.h=========================================struct video_capability{ char name[32]; int type; int channels; /* Num channels */ int audios; /* Num audio devices */ int maxwidth; /* Supported width */ int maxheight; /* And height */ int minwidth; /* Supported width */ int minheight; /* And height */};==================================================================================webcam.h=========================================#include "videodevs.h"struct video_capability vCaps;=========================================error when compiling:webcam.h:186: error: field `vCaps' has incomplete type