why showing this when patching mptcp in NS3?

[M.A. Yousuf]

Could anybody please help me, why it is showing this when I am trying to run this command 

CXXFLAGS="-Wall" ./waf configure build

Please help me!

Build failed

 -> task in 'print-introspected-doxygen' failed (exit status 1): 

{task 139991252020368: cxx print-introspected-doxygen.cc -> print-introspected-doxygen.cc.4.o}

['/usr/bin/g++', '-Wall', '-pthread', '-I.', '-I..', '-I/usr/include/libxml2', '-DNS3_ASSERT_ENABLE', '-DNS3_LOG_ENABLE', '-DHAVE_SYS_IOCTL_H=1', '-DHAVE_IF_NETS_H=1', '-DHAVE_NET_ETHERNET_H=1', '-DHAVE_PACKET_H=1', '-DHAVE_IF_TUN_H=1', '-DHAVE_GSL=1', '../utils/print-introspected-doxygen.cc', '-c', '-o', 'utils/print-introspected-doxygen.cc.4.o']