The Haskell Platform (HP) is the blessed set of libraries and tools on which
to build further Haskell libraries and applications.  It is intended to
provide a comprehensive, stable, and quality-tested base for Haskell projects
to work from.

This version specifies the following additional developer tools be installed,
for a system to be in full compliance:

 * cabal-install
 * alex
 * happy
 * haddock


WWW: http://haskell.org/platform/