tell Cygiwn to bootstrap.

bootstrap/bootstrap

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# $NetBSD: bootstrap,v 1.183 2013/01/31 22:55:21 hans Exp $
+# $NetBSD: bootstrap,v 1.184 2013/02/09 12:41:43 obache Exp $
 #
 # Copyright (c) 2001-2011 Alistair Crooks <agc@NetBSD.org>
 # All rights reserved.
@@ -467,6 +467,25 @@ AIX)
 	set_opsys=no
 	machine_arch=`get_machine_arch_aix`
 	;;
+CYGWIN_*)
+	is_root () {
+		if id -nG | grep -q 'Administrators'; then
+			return 1
+		fi
+		return 0
+	}
+	root_user=`id -u`
+	root_grou=`id -g Administrator`
+	need_bsd_install=no
+	opsys=`uname -o`
+	need_awk=no
+	need_sed=no
+	need_xargs=no
+	# only used for unprivileged builds.
+	whoamiprog='id -u'
+	groupsprog='id -g'
+	;;
+
 Darwin)
 	root_group=wheel
 	need_bsd_install=no