dbus: Version
2.1 D-Bus version.
==================
D-Bus has evolved over the years. New features have been added with new
D-Bus versions. There are two variables, which allow the determination
of the D-Bus version used.
-- Variable: dbus-compiled-version
This variable, a string, determines the version of D-Bus Emacs is
compiled against. If it cannot be determined the value is ‘nil’.
-- Variable: dbus-runtime-version
The other D-Bus version to be checked is the version of D-Bus Emacs
runs with. This string can be different from
‘dbus-compiled-version’. It is also ‘nil’, if it cannot be
determined at runtime.