If you have a hsenv environment (kind of like virtualenv, except it’s for Haskell), you can easily move it to another location and use it there; all you need to do is change a few strings in a few files. Here’s how, assuming you’re in the directory containing the .hsenv folder:

    for file in ghc_package_path_var path_var_prependix bin/activate; do
        sed -e "s,$old_location,$new_location,g" -i .hsenv/$file