when i try to compile libjxl-git, it tries to remove a rm file but that file does not exist so it will not complete the compilation to make the pkg and errors out. how do i fix this as i have no clue when it comes to modifying pkgbuilds.
compilation log
Let the AUR package maintainer know by leaving a comment on the AUR page so he can fix it. He won’t need the whole build log, just the error:
rm: cannot remove '/var/tmp/pamac-build-silver/libjxl-git/pkg/libjxl-git/usr/include/contrib': No such file or directory
alright that was what i planned to do but the maintainer said in a post that arch derivatives are not supported, so i want to see if it was a distro specific problem, that i did not notice.
Something possibly changed upstream with how files are installed. The PKGBUILD needs to be adjusted accordingly.
Then don’t tell him you’re using Manjaro. 
However, AUR packages assume you’re using Arch with a fully up to date system. If you’re not, you may experience issues. In this case, it’s just a line in the PKGBUILD removing files from the installation directory, nothing related to what versions of packages you have installed.