Necessary for automake < 1.13.
We can't run the tests in parallel and disable that, but this way all
automake versions behave in the same way.
+# 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
check_PROGRAMS = client
proxy-invalid.pem \
proxy-key.pem \
tmp
+
+# Tests can't be run in parallel.
+.NOTPARALLEL: