As i want to have “all” the packages for arch, i want to use the aur-repos with the user-maintained packages.
it is discouraged to use a utility for that because one should be able to fix and edit problems with those packages by themselves should some arise.
but… i am really lazy and after using gentoo (and after that arch) for some years, i think i will be able to at least google fo a solution.
having said that: aurutils…
i had to install them manually, obviosly, as i didnt have aurutils to install packages from aur.
Here is a guide for manual installation: https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_and_upgrading_packages
I used the following site to configure aurutils: https://gist.github.com/geosharma/afe1ea9ebe58cb67aaaba62a0d47bc7a
Some guidence on how to use aurutils may be found at https://www.reddit.com/r/archlinux/comments/bf4rvm/aurutils_guidance/ .
After that it worked and i could easily install packages from aur, without manually installing them via git.