upstream_archive = file-$(OPK_SOURCE_VERSION_UPSTREAM).tar.gz
upstream_url = ftp://ftp.astron.com/pub/file/$(upstream_archive)
source_archive = ../file-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz

$(source_archive):
	wget "$(upstream_url)"
	mv "$(upstream_archive)" "$(source_archive)"

source: $(source_archive)