debian wheezy x11 forwarding

in the /etc/sshd_conf:

X11Forwarding yes
X11UseLocalhost no


the from the client:

ssh -Y user@host

install yesod on debian wheezy

# apt-get install haskell-platform
# apt-get install yesod

$ yesod init
$ cd 
$ cabal install
$ yesod devel