No need to use pkgsrc bsd_install, awk, sed and xargs for SUA 6.0 on bootstrap.

XXX: If someone confirmed SUA 5.2 also so, please adjust "3.* | 5.*)" to "3.*)".

bootstrap/bootstrap

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# $NetBSD: bootstrap,v 1.150 2009/08/01 20:19:37 dholland Exp $
+# $NetBSD: bootstrap,v 1.151 2009/12/13 08:35:22 obache Exp $
 #
 #
 # Copyright (c) 2001-2002 Alistair G. Crooks.  All rights reserved.
@@ -596,11 +596,22 @@ Interix)
 	default_install_mode=0775
 	root_user=`id -u`
 	root_group=131616
-	need_bsd_install=yes
-	need_awk=yes
-	need_sed=yes
-	set_opsys=no
-	need_xargs=yes
+	case `uname -r` in
+	3.* | 5.*)
+		need_bsd_install=yes
+		need_awk=yes
+		need_sed=yes
+		set_opsys=no
+		need_xargs=yes
+		;;
+	*)
+		need_bsd_install=no
+		need_awk=no
+		need_sed=no
+		set_opsys=no
+		need_xargs=no
+		;;
+	esac
 	# only used for unprivileged builds
 	groupsprog="id -gn"
 	# for bootstrap only; pkgsrc uses CPPFLAGS