You need Maven 3 and Java 8 or later to build Tobago.
In the project directory you can use:
mvn clean install
to run the install target on all sub projects. This will put all necessary artifacts into your local repository.
Switch to sub-directory and call Maven to run the demo:
cd tobago-example/tobago-example-demo mvn clean jetty:run -Pjetty
Browse to the local URL http://localhost:8080/
Switch to sub-directory and call Maven to run the demo:
cd tobago-example/tobago-example-demo mvn clean jetty:run -Pjetty -Djsf=mojarra-3.0
Browse to the local URL http://localhost:8080/
Switch to sub-directory and call Maven to build and Docker to run the demo:
cd tobago-example/tobago-example-demo mvn clean install -Djsf=mojarra-3.0 docker run -it --rm -p 8080:8080 -v `pwd`/target/tobago-example-demo.war:/usr/local/tomcat/webapps/tobago-example-demo.war --name tobago-example-demo tomcat:10.0-jre11
Browse to the local URL http://localhost:8080/tobago-example-demo/