addEmacsVars () {
  if [[ -d "$1/share/emacs/site-lisp" ]]; then
      export EMACSLOADPATH="$1/share/emacs/site-lisp${EMACSLOADPATH:+:}${EMACSLOADPATH-}"
  fi
}

# If this is for a wrapper derivation, emacs and the dependencies are all
# run-time dependencies. If this is for precompiling packages into bytecode,
# emacs is a compile-time dependency of the package.
addEnvHooks "$hostOffset" addEmacsVars
addEnvHooks "$targetOffset" addEmacsVars