FabioLolix [1] filed a deletion request for dbdesigner4 [2]: Abandoned, disguised -bin pkgbuild, 32 bit only, download removed from https://downloads.mysql.com reported on 2017-10 and pkgbuild updated to use web.archive.org on 2021-02, for building from source "Kylix 3 or Delphi 7 is needed to compile the Project." report the website, those compilers seems almost 20 years old
[1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/dbdesigner4/
