upstream_base_url = http://www.bzip.org/$(OPK_SOURCE_VERSION_UPSTREAM)
upstream_url = $(upstream_base_url)/$(upstream_archive)
upstream_archive = bzip2-$(OPK_SOURCE_VERSION_UPSTREAM).tar.gz
source_archive = ../bzip2-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz
# For 1.0.6:
md5sum = 00b516f4704d4a7cb50a1d97e6e8e15b

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

source: $(source_archive)