Use the Freedesktop.org base directory specification
Description
This module can be used to find directories and files as specified by the
Freedesktop.org Base Directory Specification. This specifications gives a
mechanism to locate directories for configuration, application data and
cache data. It is suggested that desktop applications for e.g. the Gnome,
KDE or Xfce platforms follow this layout. However, the same layout can just
as well be used for non-GUI applications.
