--- a/.xinitrc	Mon Jan 02 20:25:08 2012 +0200
+++ b/.xinitrc	Mon Jan 02 20:25:43 2012 +0200
@@ -19,7 +19,7 @@
 xsetroot -gray
 
 # Don't use fvwm under Cygwin.
-if [ -z "$COMSPEC" ]; then
+if [[ -z $COMSPEC ]]; then
   fvwm &
 fi