upstream_archive = $(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).tar.gz
upstream_url = http://www.lua.org/ftp/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz
source_md5sum = 2e115fe26e435e33b0d5c022e4490567

$(source_archive):
	wget -c '$(upstream_url)'
	printf '$(source_md5sum)  $(upstream_archive)' | md5sum -c -
	mv '$(upstream_archive)' '$(source_archive)'

source: $(source_archive)