$> hackport make-ebuild dev-haskell ~/goa-3.1/goa.cabal
accepting dep(?): base >4 && <5
accepting dep(?): directory >=1.0 && <1.2
accepting dep(?): filepath >=1.1 && <1.4
accepting dep(?): process >=1.0 && <1.1
Writing goa-3.1.ebuild

$> grep -i dep ./goa-3.1.ebuild -A 10
RDEPEND=">=dev-lang/ghc-6.10.1"
DEPEND="${RDEPEND}
		>=dev-haskell/cabal-0"