Build order:

1a ghc-rpm-macros
1aa on RHEL6 only: gcc44 (dummy compat package)
1b ghc (bootstrap)
1c hscolour (bootstrap)
1d ghc-rpm-macros
1e ghc

2a ghc-primitive
2b ghc-split
2c ghc-vector
2d haskell-platform

(or cabal-install)

6a ghc-tar
6b cabal-dev

7. hsb2hs