diff -Naur freenx-server-0.7.3/nxdialog freenx-server-0.7.3-magellan/nxdialog
--- freenx-server-0.7.3/nxdialog	2012-06-05 13:59:14.472982661 +0200
+++ freenx-server-0.7.3-magellan/nxdialog	2012-06-05 14:14:27.091982661 +0200
@@ -88,7 +88,7 @@
 then
 	dialog_interface="xdialog"
 	DIALOG=/usr/bin/Xdialog # just in case that we have no good path
-elif [ -x /usr/bin/dialog ] && which xterm &>/dev/null
+elif [ -x /usr/bin/dialog ] && which xterm &>/dev/null && ! which xmessage &>/dev/null
 then
 	#JJK: Added 'dialog_interface=dialog' option because Xdialog not standard
 	#JJK: on some distros such as Fedora and xmessage won't handle long