error: implicit declaration of function ‘rt_dev_socket’

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http://unix.stackexchange.com – The developer says: http://comments.gmane.org/gmane.linux.real-time.rtnet.user/2546 Now how can I tell the Makefile to look for headers in /usr/local/rtnet/include respectively how could I set my CFLAGS? EXTRA_CFLAGS := -I ... Sorry for that not really RTnet dependent question, but I couldn't find a Makefile-howto covering this question. Maybe this helps, though it a bit more complicated due to serving 2.4 and 2.6 kernels: So, I took the makefile from here: http://svn.gna.org/viewcvs/xenomai/trunk/examples/rtdm/driver-api/ and added (HowTos)