Hi, you have to add a separator after "-I./wpan"
you should have : INCLUDES = \ -I. @V_INCLUDE_X11@ \ @V_INCLUDES@ \ -I./tcp -I./sctp -I./common -I./link -I./queue \ -I./adc -I./apps -I./mac -I./mobile -I./trace \ -I./routing -I./tools -I./classifier -I./mcast \ -I./diffusion3/lib/main -I./diffusion3/lib \ -I./diffusion3/lib/nr -I./diffusion3/ns \ -I./diffusion3/filter_core -I./asim/ -I./qs \ -I./diffserv \ -I./wpan *\* -I./mac/802_11e\