Not necessarily. It was never built against hildon libs which did have a major revamp in OS2008. Probably with a few symlinks, it would run in OS2008.

But I can't be bothered to check with ldd and manually check each library it uses is there in diablo

Anyway, for FTP, like already mentioned, MaemoFTP ftw.
But I assume you came here for a client that supports sftp which MaemoFTP does not.

Anyway, I've done another build for diablo. ssl actually enabled in this one, stripped (yes, unix terminology of stripping, not the other common form ;P), built using Os and some standard cflags to use the hardware vfp etc:
http://qwerty12.maemobox.org/gftp/

It's in deb form (like it should be) because I can't be arsed, it's not hildonised like in the first post.

Have fun entering the user and passsword ;P



(Using wmctrl to make it fullscreen):