Missing functions :
#include "dwg.h"
double dwg_model_page_x_min(_dwg_struct*) { return 0;};
double dwg_model_page_x_max(_dwg_struct*) { return 0;};
double dwg_model_page_y_min(_dwg_struct*) { return 0;};
double dwg_model_page_y_max(_dwg_struct*) {return 0;};These were not defined in the code.
