Create the pkgs dir if it does not already exist

src/scripts/import_native_build.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 assert_inside_chroot
 assert_not_root_user
 
 # Flags
 DEFINE_string architecture armel "The architecture to fetch." a
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 # Die on error
 set -e
 
-cd "${DEFAULT_BUILD_ROOT}/${FLAGS_architecture}/local_packages"
+LOCAL_PKG_DIR="${DEFAULT_BUILD_ROOT}/${FLAGS_architecture}/local_packages"
+
+mkdir -p "${LOCAL_PKG_DIR}"
+cd "${LOCAL_PKG_DIR}"
 
 DEB_BUILD_ARCH="$(dpkg-architecture -qDEB_BUILD_ARCH)"
 
 DEBS=
 for SRC; do
   SRCCACHE="$(apt-cache showsrc "$SRC")"
   BINS="$(echo "$SRCCACHE" | grep -m1 ^Binary: | cut -d' ' -f2- | sed 's/,//g')"
   VER="$(echo "$SRCCACHE" | grep -m1 ^Version: | cut -d' ' -f2)"
   for BIN in $BINS; do
     BINCACHE="$(apt-cache show "$BIN")" || continue # might be a udeb
     DEB="$(echo "$BINCACHE" | grep -m1 ^Filename: | cut -d' ' -f2 | sed "s/_${DEB_BUILD_ARCH}\.deb/_${FLAGS_architecture}.deb/")"
     wget -N "http://ports.ubuntu.com/ubuntu-ports/${DEB}"
     DEBS="$DEBS ${DEB##*/}"
   done
   cat >"${SRC}_${VER#*:}_${FLAGS_architecture}.changes" <<EOF
 Version: $VER
 Fake: yes
 EOF
 done
 
 if [ "$DEBS" ]; then
   chromiumos-build --convert -a "${FLAGS_architecture}" $DEBS
 fi