[ns] A problem at ns-2 2.1b7a:runing 'setdest', but can't find ld.elf_so

[Dong Sun <d.sun@usa.net>]

I am runing ns-allinone-2.1b7a on FreeBSD 4.2 and try to use Marc
Greis's tutorial. When I am running this command "./setdest -n 20 -p
2.0
-s 10.0 -t 200 -x 500 -y 500 > scen-20-test". It shows an error --"ELF
interpreter /usr/libexec/ld.elf_so not found".

no problems at Installation and validation (just a issue about web
cache). I am trying to use CMU Ad hoc extension, 'setdest' is used to
generate a movement pattern file.

Could anybody know how to solve and find that library?
--
Dong Sun