OpenSSL?

.github/workflows/build-test.yml

@@ -151,6 +151,7 @@ jobs:
         echo -e "$hostip crl.testsuite.nmos.tv\n$hostip ocsp.testsuite.nmos.tv" | sudo tee -a /etc/hosts > /dev/null
         # testssl.sh needs "timeout"
         brew install coreutils
+        brew install openssl
 
     - name: mac docker install
       # installs docker on a mac runner. Github's documentation states docker is already available so this shouldn't be necessary