+#### If w3m is used, HOME needs to be set, assuming default w3m config.
+#### So make sure that HOME is set to avoid run-time warning about not
+#### being able to create config directory.
+test -z "$HOME" && HOME=$MH_TEST_DIR
+HOME=$MH_TEST_DIR
+export HOME
+
+#### If w3m is used, HOME needs to be set, assuming default w3m config.
+#### So make sure that HOME is set to avoid run-time warning about not
+#### being able to create config directory.
+test -z "$HOME" && HOME=$MH_TEST_DIR
+HOME=$MH_TEST_DIR
+export HOME
+