1

For example, in Ubuntu we have:

  • indicator-application
  • indicator-application-gtk2
  • indicator-sound
  • indicator-sound-gtk2

but other indicators have only a single version that works on both:

  • indicator-cpufreq
  • indicator-weather

still others have no gtk2 version and will NOT work with gtk2-based desktops:

  • indicator-messaging

Why do some indicators need to be maintained in two versions while others do not?

1

The reason is that indicators like indicator-cpufreq and indicator-weather use an abstraction provided by indicator-application, which also has a gtk2 version. The gtk2 versions are slowly being phased out, but some still remain.

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