Packages with the diff use flag

app-admin / puppet : A system automation and configuration management software.

  • Enable diff support

dev-haskell / hashed-storage : Hashed file storage support code

  • Provide the Storage.Hashed.Diff module.

dev-util / diffoscope : Will try to get to the bottom of what makes files or directories different

  • Use sys-apps/diffutils

dev-vcs / darcs : a distributed, interactive, smart revision control system

  • Use 'lcs' for diff building.