upstream_archive = $(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).tar.bz2
upstream_url_base = http://www.freedesktop.org/software/$(OPK_SOURCE)/release
upstream_url = $(upstream_url_base)/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.bz2

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

source: $(source_archive)