One more thing Mike#2 just mentioned on IRC and I have confirmed not to be the case in Gentoo: fontconfig is not a dependency of x2goserver, though it should be.
Actually, it probably should be a dependency of net-misc/nx in general and not x2goserver, but let's ignore that "issue" for now.
Is media-libs/fontconfig installed on your system? If not, do that, rinse, repeat... and try the other stuff in my former eMail.
Mihai