/home/jia/catkin_workspace/src/darknet_ros/darknet/src/image_opencv.cpp: In function ‘image load_image_cv(char*, int)’:
/home/jia/catkin_workspace/src/darknet_ros/darknet/src/image_opencv.cpp:89:21: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
system(buff);
I use ubuntu18 g++ 6 and gcc6 please help me