Introduction
Install Haskell on CentOS
$ yum install -y epel-release
$ yum install -y haskell-platform
$ yum install -y emacs-haskell-mode
$ emacs ~/.emacs
(custom-set-variables
'(haskell-mode-hook '(turn-on-haskell-indentation)))
Compile & Execution
$ ghc --make hello.hs
$ ./hello