diff --git a/install-haskell-unstable.sh b/install-haskell-unstable.sh
new file mode 100755
index 0000000..9a4b9fc
--- /dev/null
+++ b/install-haskell-unstable.sh
@@ -0,0 +1,97 @@
+#!/usr/bin/env zsh
+
+normaluser=$1
+(( $# < 1 ))  && {
+    print -- "usage: sudo ${0:t} \$USER" >&2
+    exit 1
+}
+
+userhome="$(sudo -u $normaluser echo $HOME)"
+echo $userhome
+
+if [[ -e $userhome/.cabal ]]; then
+    print -- "Moving your ~/.cabal to ~/old.cabal"
+    sudo -u $normaluser mv $HOME/{,old}.cabal
+fi
+
+if [[ -e $userhome/.ghc ]]; then
+    print -- "Moving your ~/.ghc to ~/old.ghc"
+    sudo -u $normaluser mv $HOME/{,old}.ghc
+fi
+
+ghcversion="7.10.1"
+cabalversion="1.22.0.0"
+archi=$(uname -m)
+if [[ $(uname -s) = "Darwin" ]]; then
+    os="apple-darwin"
+    cabalos="apple-darwin-mavericks"
+else
+    if [[ $archi = "i686" ]]; then
+        archi=i386
+    fi
+    os="unknown-linux-deb7"
+    cabalos="unknown-linux"
+    # -------------------------
+    # apt-get install libgmp-dev
+fi
+
+tmpdir=/tmp/install-haskell
+mkdir -p $tmpdir
+
+cd $tmpdir
+ghctar=ghc-${ghcversion}-${archi}-${os}.tar.xz
+if [[ ! -e $ghctar ]]; then
+    echo "Downloading GHC..."
+    echo "http://www.haskell.org/ghc/dist/${ghcversion}/$ghctar"
+    curl -LO "http://www.haskell.org/ghc/dist/${ghcversion}/$ghctar"
+else
+    echo "Using already downloaded GHC ($tmpdir)..."
+fi
+echo "Installing GHC..."
+tar xJf $ghctar
+cd ghc-${ghcversion}
+./configure && make install
+
+cd $tmpdir
+echo "Downloading cabal..."
+cabaltar=cabal-${cabalversion}-${archi}-${cabalos}.tar.gz
+[[ $cabalos = "unknown-linux" ]] && cabaltar=cabal-${archi}-${cabalos}.tar.gz
+if [[ ! -e $cabaltar ]]; then
+    echo "http://www.haskell.org/cabal/release/cabal-install-$cabalversion/$cabaltar"
+    curl -LO "http://www.haskell.org/cabal/release/cabal-install-$cabalversion/$cabaltar"
+else
+    echo "Using already downloaded cabal ($tmpdir)..."
+fi
+tar xzf $cabaltar
+echo "Installing cabal..."
+if [[ -e ./cabal ]]; then
+    mv cabal /usr/local/bin
+else
+    mv ./dist/build/cabal/cabal /usr/local/bin
+fi
+
+echo "Init cabal..."
+sudo -u $normaluser cabal info >/dev/null 2>&1
+
+echo "Using Haskell LTS for GHC 7.8"
+
+# use exclusive snapshot by default.
+sudo -u $normaluser curl 'https://www.stackage.org/lts/cabal.config?global=true' >> ~/.cabal/config
+sudo -u $normaluser perl -pi -e 's#-- library-profiling: False#library-profiling: True#' $HOME/.cabal/config
+sudo -u $normaluser perl -pi -e 's#-- executable-profiling: False#executable-profiling: True#' $HOME/.cabal/config
+sudo -u $normaluser cabal update
+echo "Install useful binaries"
+sudo -u $normaluser cabal install -j alex happy
+
+echo "Update your PATH in .profile for cabal binaries"
+sudo -u $normaluser echo 'export PATH=$HOME/.cabal/bin:$PATH' >> $HOME/.profile
+
+echo "================"
+echo "Congratulations\!"
+echo "================"
+echo
+echo "You should start using Haskell like a pro now"
+echo "You shouldn't use cabal sandbox except if you know what you are doing."
+echo "So if you follow a tutorial that use cabal sandbox, don't use it."
+echo "Unless you don't mind killing some white bear and waiting a lot."
+echo