atrun: Missing Shared Object: libpam

[APseudoUtopia]

# /usr/libexec/atrun
/libexec/ld-elf.so.1: Shared object "libpam.so.4" not found, required by "atrun"

# find / -type f -name "libpam*" -ls
3274162      284 -r--r--r--    1 root             wheel
143412 Dec  5 04:48 /usr/lib/libpam.a
3273935       56 -r--r--r--    1 root             wheel
28296 Dec  4 20:33 /usr/lib/libpam.so.5

 # uname -a
FreeBSD x.x.x 8.0-RELEASE-p1 FreeBSD 8.0-RELEASE-p1 #0: Sat Dec  5
04:15:16 UTC 2009     root at x.x.x:/usr/obj/usr/src/sys/TTR  i386

Is there a way to recompile at to use the new libpam library (5,
instead of 4), without having to compile and/or install all of world?

Thanks.