Can.h files overwritten in platforms

I am trying to add uavcan_v1 to my build. I noticed that the platforms/nuttx/Nuttx/nuttx/include/nuttx/can.h and platforms/nuttx/Nuttx/nuttx/include/netpacket/can.h deleted when doing a make distclean and copied from somewhere. Where is the can.h copied from ?