gv: Unable to open the display.

[lin q]

Hi,
  I just installed gv using the cygwin installer, I select "Download from 
the internet" option and the install process runs for quite a while.

  After that I run "/usr/X11R6/bin/gv.exe" and I saw this error,

gv: Unable to open the display.

  What does that mean?

  Should I install something else for gv to run? Shoudn't cygwin installer 
already consider that?

Thanks.

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