upstream_archive = $(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).tar.xz
upstream_url = http://ftp.barfooze.de/pub/sabotage/tarballs/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.xz

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