Linux struct rtentry

I’m porting some Linux code to QNX 6.1 and ran into a few missing members in
the QNX struct rtentry (/usr/include/net/route.h).

The Linux rtentry.rt_dst maps to the QNX rt_key(&rtentry).
But what about rt_metric and rt_dev?

My guess is that these two members are not needed in QNX and can be ignored,
but I’m not sure …