One urgent problem about gcc 3.0!

[Zhi Li]

Hi,
After upgrading the gcc to version 3.0, my original program can't compile
successful anymore. Please help me, Thanks!!!
...............
tcl-1.0a7 -lotcl -L/home/lizhi/ns-allinone-2.1b8/libpcap-0.6.2 -lpcap
-R../lib -L/home/lizhi/ns-allinone-2.1b8/lib -ltk8.3 -R../lib
-L/home/lizhi/ns-allinone-2.1b8/lib -ltcl8.3  -lXext -lX11  -lsocket -lnsl
-lintl -ldl -ldl  -lm -ldl
Undefined                       first referenced
 symbol                             in file
RouteLogic::elements_in_level(int*, int)simulator.o
ld: fatal: Symbol referencing errors. No output written to ns
collect2: ld returned 1 exit status

Thanks,
Zhi Li