Start by installing the necessary packages:

wget https://miroir.univ-lorraine.fr/apache/maven/maven-3/3.8.2/binaries/apache-maven-3.8.2-bin.tar.gz

tar -zxf apache-maven-3.8.2-bin.tar.gz -C /opt/

sudo ln -s /opt/apache-maven-3.8.2/bin/ /usr/local/bin/maven

export PATH=/usr/local/bin/maven:$PATH

Next clone the github repository:

git clone https://github.com/mcMMO-Dev/mcMMO.git

Enter the newly created directory:

cd mcMMO

Now we are ready to build the plugin:

mvn clean package install

Now open the folder target and copy the plugin to the plugins folder of the server.

cd target

cp mcMMO.jar /your/server/plugins

And it’s done.