To Build :
$ apt-get install build-essential fakeroot debhelper libfile-fcntllock-perl
$ git clone https://github.com/OpenMediaVault-Plugin-Developers/openmediavault-fail2ban.git
$ cd openmediavault-fail2ban
$ fakeroot debian/rules clean binary
$ dpkg -i openmediavault-fail2ban_X.X.X_all.deb
How to install depends : apt-get install -f