I believe it's ssl not ssh. You'll find ssl at www.openssl.org
if you don't already have it installed. You could already have it installed but you might be using a Gaim-client compiled without support from it. If you compile it yourself, add the appropriate option to ./configure, I think it's --with-openssl or something similiar. If you are installing Gaim with an rpm, make sure it's made supporting ssl.