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upstream_archive = binutils-$(OPK_SOURCE_VERSION_UPSTREAM).tar.xz
upstream_url = http://ftp.gnu.org/pub/gnu/binutils/$(upstream_archive)
source_archive = ../binutils-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.xz

gpg = GNUPGHOME=gnupghome/ gpg --no-default-keyring --keyring ../keyring.gpg
keys = \
	'3A24 BC1E 8FB4 09FA 9F14  3718 13FC EF89 DD9E 3C4F'

$(source_archive):
	wget -c '$(upstream_url)' '$(upstream_url).sig'
	install -m 0700 -d gnupghome/
	[ -e ../keyring.gpg ] || \
		$(gpg) --keyserver hkp://pool.sks-keyservers.net \
			--recv-keys $(keys); \
	rm -f ../keyring.gpg~; \
	$(gpg) --verify '$(upstream_archive).sig' && \
		mv '$(upstream_archive)' '$(source_archive)'
	rm -Rf gnupghome/

source: $(source_archive)