It happen sometime when dependency are install. The FTP hang as it
doesn't close the connection properly.
Just look the process and kill ONLY the ftp one when it's at 100% and do
not close by itself. This will allow the rest of the regular pkg_add to
continue as usual.
Then the install process will continue as normal and get the next
dependency if any as nothing unusual happened.
Not a big deal when you know.
Hope this help you.
Best,
Daniel