There is a difference between the libraries needed to provide a core usable Haskell installation, and the libraries required for a particular Haskell implementation (in this case ghc) to provide basic functionality. For example, integer-gmp is an artifact of how GHC implements bigints, and haskeline and terminfo are required for ghci's line editing. We generally distinguish between "core libraries" and "GHC bootstrap libraries" ("bootlibs").