Interestingly alpha built just fine on mariadb-10.5: https://buildd.debian.org/status/fetch.php?pkg=mariadb-10.5&arch=alpha&ver=1%3A10.5.5-1%7Eexp1&stamp=1600077822&raw=0
- Bug#968893: mariadb-10.3: FTBFS on alpha: reloc... Otto Kekäläinen
- Bug#968893: Acknowledgement (mariadb-10.3:... Otto Kekäläinen
- Bug#968893: marked as done (mariadb-10.3: ... Debian Bug Tracking System