error: implicit declaration of function ‘rt_dev_socket’

**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 -I /usr/local/rtnet/include corresponding to **EXTRA_CFLAGS**** ###### CONFIGURATION ###### ### List of applications to be build APPLICATIONS = hello ### Note: to override the search path for the xeno-config script, use "make XENO=..." ### List of modules to be build MODULES = hello ### Note: to override the kernel source path, use "make KSRC=..." ###### USER SPACE BUILD (no change required normally) ###### ifeq ($(KERNELRELEASE),) ifneq ($(APPLICATIONS),) ### Default Xenomai installation path XENO ?= /usr/xenomai XENOCONFIG=$(shell PATH=$(XENO):$(XENO)/bin:$(PATH) which xeno-config 2>/dev/null) ### Sanity check ifeq ($(XENOCONFIG),) all:: @echo ">>> Invoke make like this: \"make XENO=/path/to/xeno-config\" #include #include #include #include #include #include RT_TASK demo_task; void demo(void *arg) { RT_TASK *curtask; RT_TASK_INFO curtaskinfo; printf("Hello World!\n"); curtask=rt_task_self(); rt_task_inquire(curtask,&curtaskinfo); printf("Task name : %s \n", curtaskinfo.name); ********int sockfd = rt_dev_socket(AF_INET, SOCK_DGRAM, 0);******** } int main(int argc, char* argv[]) { char str ; rt_print_auto_init(1); mlockall(MCL_CURRENT|MCL_FUTURE); printf("start task\n"); sprintf(str,"hello"); rt_task_create(&demo_task, str, 0, 50, 0); rt_task_start(&demo_task, &demo, 0); }