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为了使用 MPTCP 的一些特定常量，例如MPTCP_ENABLED，我在 iperf_tcp.c 中包含“<linux/tcp.h>”并通过插入 dirs“.../include/generated/uapi”“.../include/”来修改 Makefile uapi" ".../include" 来支持。但是，在我制作项目之后，它仍然有问题iperf_tcp.c:1319:39: error: ‘MPTCP_ENABLED’ undeclared (first use in this function)

Makefile 的相关部分附在下面。如何修改 Makefile 以支持它？

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`
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