I have managed to compile it with the larger droplet thanks. If I want to move it to smaller droplets do I just have to move the primecoind file or is there more I have to move? Also is there a easy way to move it? tar it and upload it to dropbox?
Just the primecoind file.
From the directory where it is located:
scp primecoind otherdropletip:~/.
It will ask you for a password for the other instance. You should find the compiled binary in the home directory there.