Setting up Monit from Scratch

From source

wget https://mmonit.com/monit/dist/monit-5.28.1.tar.gz
tar xzf monit-5.28.1.tar.gz

git clone https://bitbucket.org/tildeslash/monit.git
cd monit/
./bootstrap
./configure --without-pam

From pkgsrc

See the setting up pkgsrc guide and trick around the existing one, to get the latest version,

echo ACCEPTABLE_LICENSES+= gnu-agpl-v3 >> /etc/mk.conf
cd /usr/pkgsrc/sysutils/monit/
vi Makefile

...change version to e.g. monit-5.25.2...
...remove PLATFORMS...

vi PLIST

...remove PALTFORMS...

make NO_CHECKSUM=yes
make install
cp /usr/pkg/share/examples/rc.d/monit /etc/rc.d/