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Exo - Helper Applications

Exo is an extension library used in the Xfce desktop, originally developed by os-cillation. It has some helper applications that are used throughout the entire Xfce desktop to manage preferred applications and edit .desktop files.

exo is targeted at application development and is considered ready for production use. You no longer need to define the EXO_API_SUBJECT_TO_CHANGE preprocessor symbol.


Required Packages

Debugging Support

libexo currently supports four different levels of debugging support, which can be setup using the configure flag `–enable-debug' (check the output of `configure –help'):

`full'    This is the strongest option. Deprecation and some coding style
          checks are made and will cause the build to fail for any errors
          or warnings.
`yes'     This is the default for Git snapshot builds. It adds all kinds
          of checks to the code, and is therefore likely to run slower.
          Use this for development of libexo and locating bugs in libexo.
`minimum' This is the default for release builds. This is the recommended
`no'      Disables all sanity checks. Don't use this unless you know
          exactly what you are doing.

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Latest Release

  • exo 4.16.3 released (2021/12/07 22:11)
    exo 4.16.3 is now available for download from
    What is exo?
    Exo is an Xfce library targeted at application development. It contains
    various custom widgets and APIs extending the functionality of GLib and
    GTK. It also ships utilities for defining preferred applications,
    mounting storage devices and more.
    Release notes for 4.16.3
    Bugfix release on the 4.16 branch.
    Here the changelog:
    - Dont reduce selection in single click mode (Issue #71)
    - Add typecheck to prevent Gtk-CRITICAL (Issue #63)
    - exo_strdup_strftime: Support additional encoding (Issue #66)
    - Free hover_path in tree-view if not NULL
    - Fix compilation warnings
    - exo-icon-chooser-dialog: Focus filter entry by default
    - exo-icon-chooser-dialog: Set default to show to all icons
    - exo-icon-chooser-dialog: Speed up sorting the icon view model

Previous Versions

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Source Code Repository

Reporting Bugs

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