Strange closure type error building hs-kqueue on FreeBSD

Trying to compile hs-kqueue on FreeBSD 9.1 from the port fails with the following error:

c2hs: internal error: evacuate(static): strange closure type -385875968
    (GHC version 7.6.3 for x86_64_portbld_freebsd)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

I've attached the full log from the build in case it's useful.

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (LLVM)
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Strange closure type error building hs-kqueue on FreeBSD