Help needed for compiling ns-2

[Shaogang Chen <shaogang@ecn.purdue.edu>]

I post this problem before and still can not solve the problem.
The following is the error message when I compile ns-2.0b17
c++ -o net-ip.o -c -I/homes/chensg/ns-2.0b17/../Tcl  -I/usr/openwin/include  -I/homes/chensg/ns-2.0b17/../otcl-0.96 -I/homes/chensg/ns-2.0b17/../tk4.2/generic -I/homes/chensg/ns-2.0b17/../tcl7.6/generic   -I. -DNEED_SUNOS_PROTOS -DUSE_SHM -DHAVE_LIBOTCL0_96 -DHAVE_OTCL_H -DHAVE_LIBTK4_2 -DHAVE_TK_H -DHAVE_LIBTCL7_6 -DHAVE_TCL_H  -DNO_TK -Dabort=_ABORT -O2 net-ip.cc
net-ip.cc: In method `int IPNetwork::command(int, const char *const *)':
net-ip.cc:134: `IP_MULTICAST_LOOP' undeclared (first use this function)
net-ip.cc:134: (Each undeclared identifier is reported only once
net-ip.cc:134: for each function it appears in.)
net-ip.cc: In method `int IPNetwork::open(int)':
net-ip.cc:195: warning: implicit declaration of function `int bzero(...)'
net-ip.cc: In method `void IPNetwork::localname(struct sockaddr_in *)':
net-ip.cc:284: warning: implicit declaration of function `int getsockname(...)'
*** Error code 1
make: Fatal error: Command failed for target `net-ip.o'

Obviously, compiler can not find IP_MULTICAST_LOOP. I fetch the tar file
again, still get the same result. IP_MULTICAST_LOOP is not defined
in the ns-2 source tree. So it must be defined in some include file
in the unix system. I am not familiar with the multicasting in IP. 
Could someone tell where IP_MULTICAST_LOOP should be?

--Shaogang
 
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