Undefined symbols: "_processzm1zi0zi1zi4_SystemziProcess_showCommandForUser_closure"

I met a strange error when building gitit-0.7.3.12 with ghc 7.1.20110204 on MacOSX Leopard.

...
[19 of 19] Compiling Main             ( gitit.hs, dist/build/gitit/gitit-tmp/Main.o )
Linking dist/build/gitit/gitit ...
Undefined symbols:  
"_processzm1zi0zi1zi4_SystemziProcess_showCommandForUser_closure", referenced from:
      _s4gE_info in libHSghc-7.1.20110204.a(SysTools.o)
      _r12B_srt in libHSghc-7.1.20110204.a(SysTools.o)
ld: symbol(s) not found

The new function showCommandForUser was not found in System.Process.

Glasgow Haskell Compiler, Version 7.1.20110204, stage 2 booted by GHC version 6.12.3

% ghci -ignore-dot-ghci   
GHCi, version 7.1.20110204: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> :m + System.Process
Prelude System.Process> :t showCommandForUser

<interactive>:1:1: Not in scope: `showCommandForUser'
Prelude System.Process> 

I'll add build info more if you need.

Trac metadata

Trac field	Value
Version	7.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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