Just a quick note for anyone that may be running into some problems installing plugins after building from the git source.
There's a note on the Developer's documentation
Default install in /usr/local, you can change this by providing cmake appropriate option:
cmake -DPREFIX=/usr ../
It should be emphasized noted that if you don't do this, many plugins will not install properly
(as by default it seems the plugins all install to /usr/lib/opencpn and the default setting for the opencpn
git build is to install to /usr/local/lib/opencpn