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\
