upstream_archive = $(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).src.tar.gz
upstream_url = http://www.etallen.com/$(OPK_SOURCE)/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz

$(source_archive):
	wget -c -O '$(source_archive)' '$(upstream_url)'

source: $(source_archive)