-TESTS = tests-normal.sh tests-passthrough.sh
-dist_check_SCRIPTS = tests-normal.sh tests-passthrough.sh common.sh
+# Default since automake 1.13, necessary for older versions.
+AUTOMAKE_OPTIONS = color-tests parallel-tests
+
+TESTS = tests-normal.sh tests-passthrough.sh tests-authentication.sh
+dist_check_SCRIPTS = $(TESTS) common.sh