https://build.opensuse.org/package/show/openSUSE:Tools/obs-service-recompress
build for Arch fails with: "nothing provides gzip,, nothing provides bzip2,,
nothing provides xz,"

The problem is unnecessary "," in depends in PKGBUILD:
-depends=('gzip', 'bzip2', 'xz', 'zstd')
+depends=('gzip' 'bzip2' 'xz' 'zstd')

Here is a link to this package where this problem is fixed
https://build.opensuse.org/package/show/home:oleg_antonyan/obs-service-recompress

I'd like to send a pull request, but github repo
https://github.com/openSUSE/obs-service-recompress/ doe not have PKGBUILD