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unix package doesnt load in ghci on freebsd/amd64

When loading the "unix" package in ghci, the interpreter gives a link error:

$ ghci -package unix
GHCi, version 6.8.2: http://www.haskell.org/ghc/  :? for help
Loading package base ... linking ... done.
Loading package old-locale-1.0.0.0 ... linking ... done.
Loading package old-time-1.0.0.0 ... linking ... done.
Loading package filepath-1.1.0.0 ... linking ... done.
Loading package directory-1.0.0.0 ... linking ... done.
Loading package unix-2.3.0.0 ... ghc-6.8.2: can't load .so/.DLL for: util (/usr/lib/libutil.so: Undefined symbol "__mb_sb_limit")

As noted above this is ghc-6.8.2. I built from sources. My machine is:

FreeBSD hpsux 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sat Mar  8 14:07:11 HST 2008     root@hpsux:/usr/obj/usr/src/sys/GENERIC  amd64
Edited by Ian Lynagh -
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