$ cabal install

...

Warning: the following files would be used as linker inputs, but linking is
not being done: HOC_cbits.o
ghc: no input files
Usage: For basic information, try the `--help' option.
cabal: Error: some packages failed to install:
HOC-1.0 failed during the building phase. The exception was:
exit: ExitFailure 1



$ cabal --version
cabal-install version 0.6.0
using version 1.6.0.1 of the Cabal library 

$ uname -a
Darwin Celebrian.local 9.5.0 Darwin Kernel Version 9.5.0: Wed Sep  3
11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386 i386