upstream_archive = jpegsrc.v$(OPK_SOURCE_VERSION_UPSTREAM).tar.gz
upstream_url = http://www.ijg.org/files/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz

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

source: $(source_archive)