[MacPorts] #34343: dbus: uses startupitem.install, which fails on MacPorts < 2.1

[MacPorts]

#34343: dbus: uses startupitem.install, which fails on MacPorts < 2.1
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  pixilla@…           
     Type:  defect                   |      Status:  new                 
 Priority:  Normal                   |   Milestone:                      
Component:  ports                    |     Version:  2.0.4               
 Keywords:                           |        Port:  dbus                
-------------------------------------+--------------------------------------

Comment(by pixilla@…):

 Ryan: Would a test/set before the first use of startupitem.install be a
 good solution?
 {{{
 +# The startupitem.install keyword does not exist in MacPorts < 2.1.
 +if {![info exists ${startupitem.install}]} {
 +    set startupitem.install yes
 +}
 pre-configure {
 }}}

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Ticket URL: <https://trac.macports.org/ticket/34343#comment:11>
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