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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 to determine the used D-Bus version.

— 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.