Missing # $FreeBSD$ at the top.

Use DISTVERSION

Add LICENSE_FILE if possible.

Typo?

Not sure why this is necessary, but please use ${MKDIR} and ${MV}.

Too short.

No, following the instructions at the bottom of https://github.com/circonus-labs/circonus-agent, users might expect this name.

dep wants the build directory in the standard Go layout and on top of that, doesn't want to see the same source twice, so I moved the contents to where a symlink is usually constructed by post-extract in the go uses file.

I wonder what good is USES=go if you overwrite all the targets it uses. If it is to get the dependency on go, better add it yourself rather than depending on USES=go to do it.

default, remove.

This is bogus, %%ETCDIR%% is supposed to be a directory, not part of a path, so you should set ETCDIR=${PREFIX}/etc/circonus-agentd in the Makefile.

Also, might be better to use PLIST_FILES since the plist is so short.