yum groupinstall "Development Tools" -y
yum install gmp-devel # may need epel
sudo ln -s /usr/lib64/libgmp.so.3  /usr/lib64/libgmp.so.10

dir="$(mktemp -d)"
pushd "$dir"
wget https://haskell.org/platform/download/7.10.2/haskell-platform-7.10.2-a-unknown-linux-deb7.tar.gz
tar xvzf haskell-platform-7.10.2-a-unknown-linux-deb7.tar.gz
./install-haskell-platform.sh
popd
rm -r "$dir"

cabal update
cabal install shellcheck

cp ~/.cabal/bin/shellcheck /usr/local/bin # portable to other el6 systems without Haskell