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upstream_ver = $$(printf '%s\n' '$(OPK_SOURCE_VERSION_UPSTREAM)' | \
	sed 's/+sip[1-9][0-9]*.*$$//')
upstream_archive = binutils-$(upstream_ver).tar.xz
upstream_url = http://ftp.gnu.org/pub/gnu/binutils/$(upstream_archive)
source_archive = ../binutils-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.bz2

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~; \
	if ! $(gpg) --verify "$(upstream_archive).sig"; then \
		rm -Rf gnupghome/; \
		exit 1; \
	fi
	rm -Rf gnupghome/
	tar -xJf "$(upstream_archive)"
	rm -Rf "binutils-$(upstream_ver)/zlib/"
	tar -cjf '$(source_archive)' "binutils-$(upstream_ver)/"
	rm -Rf src/
	mv "binutils-$(upstream_ver)/" src/

source: $(source_archive)