The flag '-h' isn't universal across implementation. According to FreeBSD man page for ln you can use 'n'.
@@ -19,7 +19,7 @@ mark() {
MARK="$1"
fi
if read -q \?"Mark $PWD as ${MARK}? (y/n) "; then
- mkdir -p "$MARKPATH"; ln -sfh "$PWD" "$MARKPATH/$MARK"
+ mkdir -p "$MARKPATH"; ln -sfn "$PWD" "$MARKPATH/$MARK"
}