没有设置搜索路径，DeepStream 头文件位置在
/opt/nvidia/deepstream/deepstream-5.1/sources/includes把下面两行代码添加到 /etc/profile 文件中即可。
export C_INCLUDE_PATH=/usr/include/gstreamer-1.0:/usr/include/glib-2.0:/usr/lib/aarch64-linux-gnu/glib-2.0/include:/opt/nvidia/deepstream/deepstream-5.1/sources/includes:$C_INCLUDE_PATH
export CPLUS_INCLUDE_PATH=/usr/include/gstreamer-1.0:/usr/include/glib-2.0:/usr/lib/aarch64-linux-gnu/glib-2.0/include:/opt/nvidia/deepstream/deepstream-5.1/sources/includes:$CPLUS_INCLUDE_PATH