NixOS/nixpkgs — pull request #466 by Davorak (2013-04-15 21:21:45+00:00)
Title: Addded for ./doc, ./lib files, added (pre|post)Install support.

With this commit ghc-wrappers will add ghc's documentation to
./nix-profile. ${ghc.version} is appended to the default documenation
folder so multiple ghc versions will not clobber each other.

Added support for preInstall and postInstall hooks.