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I think these might cause problems when using libunbound in a program that itself uses yacc and compiling with -fno-common.
I spotted it in unwind(8) when trying to make it clang11 ready which has -fno-common on by default.
unwind link in libunbound statically and has its own peculiar make system so this might be self-inflicted or not
actually happing for other libunbound users.
In any case it would be appreciated if this could be merged, it will make my life easier and shouldn't cause harm for unbound.