upstream_base_name = $(upstream_source)-$(OPK_SOURCE_VERSION_UPSTREAM)
upstream_dir = http://www.freedesktop.org/software/$(upstream_source)
upstream_base_ver = $$(printf '%s\n' '$(OPK_SOURCE_VERSION_UPSTREAM)' | \
	sed 's/^\([0-9]*\.[0-9]*\)\..*$$/\1/')
upstream_base_url = $(upstream_dir)/release/$(upstream_base_name)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz

$(source_archive):
	wget -c "$(upstream_base_url).tar.bz2"
	wget -O - "$(upstream_base_url).tar.bz2.sha256" | grep -F .tar.bz2 >sha256sum
	sha256sum -c sha256sum
	rm sha256sum
	tar -xjf '$(upstream_base_name).tar.bz2'
	rm '$(upstream_base_name).tar.bz2'
	tar -czf '$(source_archive)' $(upstream_source)-*
	mv $(upstream_source)-*/ src/

source: $(source_archive)