if you do, please pm me because if i give you my referall code i get an additional 250 mbs of space. for anyone who doesnt know what koding is, it is a site that is kind of like a virtual machine on a website
I heard you couldn't. Though you might try ssh-ing from another terminal (ie from your computer, not from koding) and adding the -X flag, then from there run your SFML program. If this doesn't work, you might need to configure X on the server.
You can compile SFML on the server but you probably can't run them without a running Xorg server (which is difficult to setup without a native graphics driver, although its still possible with framebuffer support at the driver level on Linux).
I'm currently searching for a few ways to forward USB packets to the server so I can test my drivers (instead of possibly causing my system to become unstable). It's also more useful for web production and interpreted languages, especially if you're on a Windows desktop yourself. For instance, setting up a CGI service using C++ via Koding is a lot more convenient than going through some other service or setting up a web server on your own desktop (which I do on my own Linode server anyways though).