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.