upstream_archive = opkg-$(OPK_SOURCE_VERSION_UPSTREAM).tar.gz
upstream_url = http://opkg.googlecode.com/files/$(upstream_archive)
source_archive = ../opkg-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz

$(source_archive):
	wget -c '$(upstream_url)'
	mv '$(upstream_archive)' '$(source_archive)'

source: $(source_archive)