Haskell Platform Instead of MacPorts

Someone hospitably suggested me in this comment to use Haskell Platform instead of MacPorts to install ghc or other haskell libraries.

• http://hackage.haskell.org/platform/

As most Mac users know, it takes 12+ hours to build ghc. Once you typed sudo port install ghc, you would have to go to bed and sleep for half a day.

The Haskell Platform is a binary package, so now we don't have to

Installing pandoc via Haskell Platform cabal

cabal update
cabal install pandoc

then

Resolving dependencies...
[1 of 1] Compiling Main             ( /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/pandoc-1.2.12656/pandoc-1.2.1/Setup.hs, /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/pandoc-1.2.12656/pandoc-1.2.1/dist/setup/Main.o )
Linking /var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/pandoc-1.2.12656/pandoc-1.2.1/dist/setup/setup ...
Configuring pandoc-1.2.1...
Preprocessing library pandoc-1.2.1...
Preprocessing executables for pandoc-1.2.1...
Building pandoc-1.2.1...

src/Text/Pandoc/Shared.hs:118:7:
    Could not find module `Network.URI':
      There are files missing in the `network-2.2.1.4' package,
      try running 'ghc-pkg check'.
      Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:
pandoc-1.2.1 failed during the building phase. The exception was:
exit: ExitFailure 1
~/.cabal
$ pandoc install network
pandoc: install: openBinaryFile: does not exist (No such file or directory)
$ ghc-pkg check |& grep network-
There are problems in package network-2.2.1.4:
  import-dirs: /Users/ujihisa/.cabal/lib/network-2.2.1.4/ghc-6.10.3 doesn't exist or isn't a directory
  library-dirs: /Users/ujihisa/.cabal/lib/network-2.2.1.4/ghc-6.10.3 doesn't exist or isn't a directory
  include-dirs: /Users/ujihisa/.cabal/lib/network-2.2.1.4/ghc-6.10.3/include doesn't exist or isn't a directory
  cannot find libHSnetwork-2.2.1.4.a on library path
network-2.2.1.4
network-2.2.1
network-2.2.1.1

hmm...