[ns] i can't install ns-allinone-2.1b3 with FreeBSD 4.1

[=?ks_c_5601-1987?B?seizsrHi?= <ngkim@camars.kaist.ac.kr>]

Hi. I'm a graduate student in Korea.

I want to install ns-allinone-2.1b3.tar.gz for cmu-extendedns-1.1.2.tar.gz

but i can't install ns-allinone-2.1b3.tar.gz with FreeBSD 4.1 because of following a problem:

==============================================================
........
checking for X11 library archive
checking for XOpenDisplay in -lX11... (cached) no
checking for libXext.a
checking for Dbg.h... no
checking for libtcldbg... no
checking dmalloc... not requested with --with-dmalloc
checking for perl... /usr/bin
Explicitly disabling static compilation
no dynamic load lib
checking for a BSD compatible install... (cached) /usr/bin/install -c
updating cache ./config.cache
creating ./config.status
creating Makefile
c++ -c -g -DNO_TK -DTCLCL_CLASSINSTVAR  -DNDEBUG -DUSE_SHM -DHAVE_LIBTCLCL1_0B5
-DHAVE_TCLCL_H -DHAVE_LIBOTCL1_0A2 -DHAVE_OTCL_H -DHAVE_LIBTK8_0 -DHAVE_TK_H -DH
AVE_LIBTCL8_0 -DHAVE_TCL_H -I. -I/usr/X11R6/include  -I../TclCL -I../otcl -I../t
kbox/include -I../tclbox/include -o trace.o trace.cc
In file included from trace.cc:45:
tcp.h:175: ANSI C++ forbids declaration `print_if_needed' with no type
*** Error code 1
 
Stop in /usr/home/ngkim/Adhoc/ns-allinone-2.1b3/ns-2.
Ns make failed! Exiting ...
========================================================

What can I do?

Thanks for your help..