implement X11 server on Apple iOS

[Han]

Hi,

I'd like to use/implement X11 server on my iPad for remotely running
one of my Linux application.  As I know the apple iOS does not support
X11 by default. A quick search shows only one iPad app (iSSH) supports
this and it doesn't seem to be open source.  I am wondering if there
is any pointers for implementing X11 server on apple iOS (particularly
on iPad).

thanks in advance.

Han