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upstream_version = $$(printf '%s\n' $(OPK_SOURCE_VERSION_UPSTREAM) | \
	sed 's/+.*//')
upstream_archive = $(OPK_SOURCE)-$(upstream_version).tar.gz
upstream_url = http://ftp.gnu.org/gnu/$(OPK_SOURCE)/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz
keys = \
	'259B 3792 B3D6 D319 212C  C4DC D5BF 9FEB 0313 653A'

$(source_archive):
	wget -c "$(upstream_url)"
	set -e; if gpg --version >/dev/null 2>&1; then \
		wget -c "$(upstream_url).sig"; \
		[ -e ../keyring.gpg ] || \
			gpg --keyring ../keyring.gpg --no-default-keyring \
				--keyserver hkp://pool.sks-keyservers.net \
				--recv-keys $(keys) || true; \
		rm -f ../keyring.gpg~; \
		gpg --verify --keyring ../keyring.gpg \
			"$(upstream_archive).sig"; \
	fi
	mv "$(upstream_archive)" '$(source_archive)'

source: $(source_archive)