Hi, tar fails to build from source in unstable, because some of its functions clash with the function namespace of acl and the latter recently added new symbols. tar needs to rename its own and indeed did so upstream already. https://lists.nongnu.org/archive/html/acl-devel/2026-06/msg00000.html https://lists.nongnu.org/archive/html/bug-tar/2026-06/msg00013.html Please upload a new upstream version or cherry-pick the patch. Helmut