It seems that there are applications like gv-3.5.8-2 that require gs-x11.
If you look at the post-install, gv.sh, at the end, it says:
# Quiet the cygwin mailing lists about 'unknown device x11' mails
cd /bin
ln -sf /usr/X11R6/bin/gs.exe gs-x11
(the comment # Quiet... is in gv.sh!)
Cheers,
Angelo
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