Whenever I try to print a PDF file from ghostview (pkgsrc/print/gv) it
   fails.  It appears that the conversion from PDF to postscript prior to
   submiting the print job either doesn't happen or the program looses
   track of the appropriate temporary file (though I never see an
   appropriate temporary file created).

It turns out there is a simple solution:  fix
/usr/X11R6/lib/X11/app-defaults/GV.

GV.gsCmdConvPDF:	gs -dQUIET -dNOPAUSE -dBATCH -sDEVICE=pswrite -sOutputFile=%s %s

See PR pkg/12365.

Cheers,
Brook