Link error while compiling executables

On GHC master (ef786b6c) attempting to build any executable results in a linker error. For instance, cabal install cmdargs results in,

     [37 of 37] Compiling Main             ( Main.hs, dist/build/cmdargs/cmdargs-tmp/Main.o )
     Linking dist/build/cmdargs/cmdargs ...
     /usr/bin/ld: cannot find -lHStransformers-0.3.0.0-ghc7.7.20121009
     collect2: error: ld returned 1 exit status
     cabal: Error: some packages failed to install:
     cmdargs-0.10 failed during the building phase. The exception was:
     ExitFailure 1

Yet transformers appears to be installed (although the version suffix doesn't appear to match),

     $ ls ~/.cabal/lib/transformers-0.3.0.0/ghc-7.7.20121009/
     Control  Data  HStransformers-0.3.0.0.o  libHStransformers-0.3.0.0.a  libHStransformers-0.3.0.0_p.a