message: okay we don't have root, install to /Users/stitt4/local instead
diff: set -e
  +install_dir=$HOME/local
  +mkdir -p $install_dir
  +
  # build and install mfem
  git clone https://github.com/mfem/mfem.git
  pushd mfem
  make serial SHARED=YES -j8
  -make install PREFIX=/usr
  +make install PREFIX=$install_dir
  popd
  # include xeus-glvis
  git clone https://github.com/GLVis/xeus-glvis.git
  pushd xeus-glvis
  -target_dir=/usr/include/glvis
  -mkdir -p $target_dir
  -cp include/xglvis.hpp $target_dir
  +glvis_dir=$install_dir/glvis
  +mkdir -p $glvis_dir
  +cp include/xglvis.hpp $glvis_dir
  popd
  