sudo apt-get install ghc cabal-install zlib1g-dev cabal update cabal install cabal-install
wget http://www.haskell.org/ghc/dist/7.0.4/ghc-7.0.4-x86_64-unknown-linux.tar.bz2 tar tvfj ghc-7.0.4-x86_64-unknown-linux.tar.bz2 cd ghc-7.0.4 ./configure sudo make install
cabal install yesod