Internal error compiling ghc-syb-0.1.2.1

On Ubuntu Karmic x86_64 (installed from the apt repo), when I try to compile the ghc-syb-0.1.2.1 package I get the following output:

Building ghc-syb-0.1.2.1...
[1 of 2] Compiling GHC.SYB.Instances ( src/GHC/SYB/Instances.hs, dist/build/GHC/SYB/Instances.o )
ghc: internal error: evacuate: strange closure type 13771848
    (GHC version 6.10.4 for x86_64_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Edited Mar 09, 2019 by Ian Lynagh -

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Internal error compiling ghc-syb-0.1.2.1