The included dirs in Makefile are not used

Question

For using some specific constants of MPTCP such as MPTCP_ENABLED, I include "<linux/tcp.h>"in iperf_tcp.c and modify the Makefile by inserting dirs ".../include/generated/uapi" ".../include/uapi" ".../include" to support. However, after I make the project, it still has problem with iperf_tcp.c:1319:39: error: ‘MPTCP_ENABLED’ undeclared (first use in this function)

The relative piece of Makefile is attached below. How to modify the Makefile to support it?

iperf3_profile-iperf_tcp.o: iperf_tcp.c
        $(AM_V_CC)$(CC) $(DEFS) -I /home/cx/mptcp/include/generated/uapi/ -I /home/cx/mptcp/include/uapi  -I /home/cx/mptcp/include/ $(AM_CPPFLAGS) $(CPPFLAGS) $(iperf3_profile_CFLAGS) $(CFLAGS) -MT iperf3_profile-iperf_tcp.o -MD -MP -MF $(DEPDIR)/iperf3_profile-iperf_tcp.Tpo -c -o iperf3_profile-iperf_tcp.o `test -f 'iperf_tcp.c' || echo '$(srcdir)/'`iperf_tcp.c
        $(AM_V_at)$(am__mv) $(DEPDIR)/iperf3_profile-iperf_tcp.Tpo $(DEPDIR)/iperf3_profile-iperf_tcp.Po
#       $(AM_V_CC)source='iperf_tcp.c' object='iperf3_profile-iperf_tcp.o' libtool=no \
#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(iperf3_profile_CFLAGS) $(CFLAGS) -c -o iperf3_profile-iperf_tcp.o `test -f 'iperf_tcp.c' || echo '$(srcdir)/'`iperf_tcp.c

iperf3_profile-iperf_tcp.obj: iperf_tcp.c
        $(AM_V_CC)$(CC) $(DEFS)   -I /home/cx/mptcp/include/generated/uapi/ -I /home/cx/mptcp/include/uapi  -I /home/cx/mptcp/include/ $(AM_CPPFLAGS) $(CPPFLAGS) $(iperf3_profile_CFLAGS) $(CFLAGS) -MT iperf3_profile-iperf_tcp.obj -MD -MP -MF $(DEPDIR)/iperf3_profile-iperf_tcp.Tpo -c -o iperf3_profile-iperf_tcp.obj `if test -f 'iperf_tcp.c'; then $(CYGPATH_W) 'iperf_tcp.c'; else $(CYGPATH_W) '$(srcdir)/iperf_tcp.c'; fi`
        $(AM_V_at)$(am__mv) $(DEPDIR)/iperf3_profile-iperf_tcp.Tpo $(DEPDIR)/iperf3_profile-iperf_tcp.Po
#       $(AM_V_CC)source='iperf_tcp.c' object='iperf3_profile-iperf_tcp.obj' libtool=no \
#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(iperf3_profile_CFLAGS) $(CFLAGS) -c -o iperf3_profile-iperf_tcp.obj `if test -f 'iperf_tcp.c'; then $(CYGPATH_W) 'iperf_tcp.c'; else $(CYGPATH_W) '$(srcdir)/iperf_tcp.c'; fi`