> Did you by any chance write
> 
> If you did, then I think that's the problem. Everything after the colon are
> prerequisites (dependencies) to the target (do-test), see here[1].
> Prerequisites are simply other targets you'd want executed *before* the
> do-test target. So in this case make tries to execute the 'cd' target which
> doesn't exist.
> 
> [1] https://man.openbsd.org/make#DEPENDENCY_LINES
> 

It was a slightly different error of my own personal creation with 
similarly disastrous results. Somehow, when I pasted from Edd's example, 
my editor turned tabs into spaces and things broke as demonstrated.

That mistake has already been corrected in the TGZ of the updated port 
which I submitted for approval.

All of that said, thank you for the nudge towards the man pages for a 
better understanding of why it broke. :)

-R