First just how did you install this software ?
I am seeing this
https://sourceforge.net/projects/xrdp/
but is is version 0.5 "xrdp-0.5.0.tar.gz"
have you looked on the SF mailing list for that project ?
https://sourceforge.net/mailarchive/...ame=xrdp-devel
but opensuse has a very NICE and already installed VNC , installed by default
open up yast2 and look
also it is time to think about upgrading to 12.1 or very soon 12.2
support for 11.4 will be ending soon , this coming September