The previous comment isn't right, my mistake.
This commit is needed to fix it, included in 9.16.2:
commit 4cc7d2412f63d8878cd8c806752cc2d7b5a580ab
Author: Petr Menšík
Date: Wed Apr 1 14:28:42 2020 +0200
Link all required libraries to libisc
It would fail to link -lisc without
oh well, building a version from Debian which has proper libs fails just
as well on focal, so it's not bind9's fault but something else
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Title:
** Summary changed:
- bind9-libs not properly linked?
+ bind9-libs not properly linked in focal?
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Title:
bind9-libs not properly linked in