When building GHC: Failed to load interface for `GHC.Fingerprint'

when doing a build with THREADS=1, we are getting things like:

inplace/bin/ghc-stage1 [...] -c libraries/time/./Data/Time/Calendar/Days.hs [...]
/home/ian/ghc/git/ghc/libraries/base/dist-install/build/Data/Typeable/Internal.dyn_hi
Declaration for mkTyConApp
Unfolding of Data.Typeable.Internal.mkTyConApp:
  Failed to load interface for `GHC.Fingerprint'
  Perhaps you haven't installed the "dyn" libraries for package `base'?
  Use -v to see a list of the files searched for.
/home/ian/ghc/git/ghc/libraries/base/dist-install/build/Data/Typeable.dyn_hi
Declaration for mkTyCon
Unfolding of Data.Typeable.mkTyCon:
  Can't find interface-file declaration for variable GHC.Fingerprint.fingerprintString
    Probable cause: bug in .hi-boot file, or inconsistent .hi file
    Use -ddump-if-trace to get an idea of which file caused the error

(we only have Fingerprint.dyn_hi-boot). GHC still exits successfully, however.

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/base
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