Compiling Prelude.hs or complete base to external core

[Carlos Lopez Camey]

Hi, I have an interpreter for external core and I would like to read the 
definitions in base:Prelude. After jumping over some obstacles [0], I 
find myself here:

 > ghc --make -fext-core -I./include -cpp Prelude.hs

GHC/Num.lhs:65:27:
     Could not deduce (base:GHC.Num.Num a) arising from the literal `0'
     from the context (Num a)
       bound by the class declaration for `Num'
       at GHC/Num.lhs:(42,1)-(65,31)
     Possible fix:
       add (base:GHC.Num.Num a) to the context of
         the class declaration for `Num'
     In the first argument of `(-)', namely `0'
     In the expression: 0 - x
     In an equation for `negate': negate x = 0 - x

If I jump over this one with some nonsense fix (e.g. negate = id) then I get

GHC/Exception.lhs:47:14:
     Cannot derive well-kinded instance of form `Typeable
                                                   * (SomeException ...)'
       Class `Typeable' expects an argument of kind `k'
     In the data declaration for `SomeException'

GHC/Exception.lhs:169:24:
     Cannot derive well-kinded instance of form `Typeable
                                                   * (ErrorCall ...)'
       Class `Typeable' expects an argument of kind `k'
     In the newtype declaration for `ErrorCall'

GHC/Exception.lhs:186:22:
     Cannot derive well-kinded instance of form `Typeable
                                                   * (ArithException ...)'
       Class `Typeable' expects an argument of kind `k'
     In the data declaration for `ArithException'

Do you have any tips that help me? I am using the HEAD version of base 
and GHC 7.6.2.

I also tried base-4.6.0.0 but the file HsFFI.h is looked upon and is not 
found or is not generated by ./configure (ieee-flpt.h: is a similar 
case, although I could find this one on the web [1]).

[0] Manually compiled GHC/Event/{Poll,Clock,EPoll} with hsc2hs
[1] http://darcs.haskell.org/packages/base/include/ieee-flpt.h

Thanks
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