The build outputs MBs of reports like: "warning: builtin __has_trivial_assign is deprecated; use __is_trivially_assignable instead [-Wdeprecated-builtins]" This might somehow supress the error output (or cause the error) of the sporadic "Error -9". Suggested by: des@ via https://lists.freebsd.org/archives/freebsd-ports/2025-May/007910.html