Error in following the instruction mentioned in the doc.

[wpoosanguansit]

I cloned the project and followed the instruction and I have got the following errors:

haskell-servant.github.io git:(hakyll) ✗ cabal build
Package has never been configured. Configuring with default flags. If this
fails, please run configure manually.
Resolving dependencies...
Warning: solver failed to find a solution:
Could not resolve dependencies:
trying: haskell-servant-github-io-0.4.0 (user goal)
next goal: pandoc (dependency of haskell-servant-github-io-0.4.0)
Dependency tree exhaustively searched.
Trying configure anyway.
Configuring haskell-servant-github-io-0.4.0...
cabal: Encountered missing dependencies:
hakyll ==4.6., pandoc ==1.13.

I am using the latest haskell-platform

GHCi, version 8.0.1: http://www.haskell.org/ghc/ :? for help
Prelude>

Is the doc up to date? Or is there anything beside listed steps that is missing? Thanks for your help.