There's a closed pull request on the void-packages repository

compton-conf: remove package
https://github.com/void-linux/void-packages/pull/36034

Description:
Not usable because compton was replaced by picom and this program writes outdated values into a wrong configuration file.

On https://github.com/lxqt/compton-conf it also says, that it will receive no further updates and should be considered deprecated.

Another possibility is to use this fork: https://github.com/redtide/picom-conf? Unfortunately, this doesn't have a release yet.

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