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

git: add perl-CGI to depends to fix gitweb
https://github.com/void-linux/void-packages/pull/37018

Description:
When `perl-CGI` is not installed, `git instaweb` opens a blank browser page. This is not a new problem <https://bbs.archlinux.org/viewtopic.php?id=203412>.
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