upstream_archive = pcre-$(OPK_SOURCE_VERSION_UPSTREAM).zip
upstream_base_url = ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre
upstream_url = $(upstream_base_url)/$(upstream_archive)
source_archive = ../$(OPK_SOURCE)-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.gz
keys = '45F6 8D54 BBE2 3FB3 039B  46E5 9766 E084 FB0F 43D8'

$(source_archive):
	wget -c '$(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 \
				--recv-keys $(keys) || true; \
		rm -f ../keyring.gpg~; \
		gpg --verify --keyring ../keyring.gpg \
			'$(upstream_archive).sig'; \
	fi
	unzip '$(upstream_archive)' >/dev/null
	rm '$(upstream_archive)' '$(upstream_archive).sig'
	tar -czf '$(source_archive)' 'pcre-$(OPK_SOURCE_VERSION_UPSTREAM)'
	mv 'pcre-$(OPK_SOURCE_VERSION_UPSTREAM)' 'src'

source: $(source_archive)