I looked for exactly this bug as I fixed the same issue in binutils-riscv-unknown-elf today, but somehow I missed it.
This should be fixed in version 18 by using dpkg-query instead of
hand-hacked shell bits:
upstream_version := $(shell dpkg-query -W -f="\$${source:Upstream-Version}\n"
binutils-source)
--
-keith
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