ctags is a useful utility you can use to read and move around the source code more efficiently. The built-in ctags(1) however is not the Exuberant Ctags utility you might expect.

You can install Exuberant Ctags (exctags(1)) using either ports or pkg:

Build exctags(1) using ports

cd /usr/ports/devel/ctags/ && make install clean

Download and install a prebuilt binary of Exuberant Ctags:

pkg install ctags

Create the tag file

exctags -R