I am trying to install the cpphs package with the current HEAD version of Haskell. When I ask cabal to do the installation, I get the following error:

Babylon:/Users/kfisher/sw/ghc-head-libraries/cpphs-1.11> ~/.cabal/bin/cabal install cpphs -w ~/ghc-head/bin/ghc --with-haddock=/Users/kfisher/ghc-head/bin/haddock --package-db=/Users/kfisher/ghc-head/lib/ghc-6.13.20100831/package.conf.d Resolving dependencies... cabal: cannot configure unix-2.4.0.1. It requires base ==4.2.* For the dependency on base ==4.2.* there are these packages: base-4.2.0.0, base-4.2.0.1 and base-4.2.0.2. However none of them are available. base-4.2.0.0 was excluded because base-4.3.0.0 was selected instead base-4.2.0.0 was excluded because of the top level dependency base -any base-4.2.0.1 was excluded because base-4.3.0.0 was selected instead base-4.2.0.1 was excluded because of the top level dependency base -any base-4.2.0.2 was excluded because base-4.3.0.0 was selected instead base-4.2.0.2 was excluded because of the top level dependency base -any Babylon:/Users/kfisher/sw/ghc-head-libraries/cpphs-1.11>

This seems odd for multiple reasons: 1. I already have unix-2.4.0.1 installed (it was a boot library). So why is cabal trying to install it again? 2. Given that I already have unix-2.4.0.1 installed and my base is 4.3.0.0, why does unix-2.4.0.1 report that it needs base==4.2.*? 3. Given that the cabal file for cpphs says it needs base < 6 and haskell98 and my package database satisfies both of those constraints, why is cabal trying to install anything else? I include the listing of my installed packages below. What is going on is probably obvious to someone who knows more about the library installation process. Any ideas? Kathleen

Babylon:/Users/kfisher/sw/ghc-head-libraries/cpphs-1.11>~/ghc-head/bin/ghc-pkg list /Users/kfisher/ghc-head/lib/ghc-6.13.20100831/package.conf.d: Cabal-1.9.2 HUnit-1.2.2.1 array-0.3.0.0 base-4.3.0.0 bin-package-db-0.0.0.0 (binary-0.5.0.2) bytestring-0.9.1.7 containers-0.3.0.0 directory-1.0.1.2 dph-base-0.4.0 (dph-par-0.4.0) (dph-prim-interface-0.4.0) (dph-prim-par-0.4.0) (dph-prim-seq-0.4.0) (dph-seq-0.4.0) extensible-exceptions-0.1.1.2 ffi-1.0 filepath-1.2.0.0 (ghc-6.13.20100831) ghc-prim-0.2.0.0 (haskell2010-1.0.0.0) haskell98-1.0.1.1 hpc-0.5.0.5 integer-gmp-0.2.0.0 mtl-1.1.0.2 old-locale-1.0.0.2 old-time-1.0.0.5 pretty-1.0.1.1 process-1.0.1.3 random-1.0.0.2 regex-base-0.93.2 regex-posix-0.94.4 rts-1.0 syb-0.2.1 template-haskell-2.4.0.0 time-1.2.0.3 unix-2.4.0.1