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When a formula's dependency tree contains more than one X11 dependency, they are de-duplicated by comparing the min_version attribute. However, this can result in broken dependency trees if one of the X11Dependency objects was actually specified as e.g. `:libpng`. In practice, this only matters when one or more of the dependencies has additional metadata that makes it distinct from the rest, i.e. an :optional or :recommended tag. To combat this, make these special, "partial" X11 dependencies instances of different classes so that they are not de-duped. It will still be necessary, at the time when requirements are expanded by the installer, to de-duplicate any remaining X11 dependencies after applying the optional/recommended filters in order to avoid duplicated modifications to the environment (as ENV.x11 is not idempotent). c.f. Homebrew/homebrew#17369.
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