[GRASSLIST:4966] problem starting tcltk for Grass53 under Cygwin

Hi,

I've just installed the software on an XP machine- all is fine except I can't start the tcltk interface.
Get the following error message:

Application initialization failed: no display name and no $DISPLAY environment variable

Error in startup script: invalid name "bind"
while executing
"bing balloon <ENTER> {
set balloonHelp(%W,after) [after 400 {updateBalloonHelp %W}]
}
(procedure "BalloonInit" line 2)
invoked from within
"BalloonInit"
(file "/usr/local/grass53/tcltkgrass/main/gui.tcl" line 1677)
invoked from within
"source $env (TCLTKGRASSBASE)/main/gui.tcl"
invoked from within
"if [catch {source $env(TCLTKGRASSBASE)/main/gui.tcl}] {
set env(TCLTKGRASSBASE) $env(GISBASE)/tcltkgrass
source $env(TCLTKGRASSBASE)/main/gui...."
(file "/usr/local/grass53/bin/tcltkgrass" line 26)

Any ideas?

Thanks in anticipation...

Lawrence

ps. how can I cut and paste such error messages- I had to copy this one out myself!