Package: ruby-i18n Version: 1.5.3-1 The ruby-i18n 1.5.3-1 version currently shipped in Debian Buster ships the gemspec as 0.7.0: /usr/share/rubygems-integration/all/specifications/i18n-0.7.0.gemspec
I don't understand how or why there's a version mismatch there, but it's actually useful as other packages have gemspecs that expect ruby-i18n version 0.7. However, upon rebuilding ruby-i18n on current debian buster, the resultant packages instead install the gemspec as /usr/share/rubygems-integration/all/specifications/i18n-1.5.3.gemspec And if you then install that newly rebuilt package, and then try to build/rebuild (e.g.) jekyll, the build will fail because jekyll's gemspec specifically looks for ruby-i18n 0.7.