[MacPorts] #38979: gtkmm 2.24.3_1: build failure on 10.5.8

[MacPorts]

#38979: gtkmm 2.24.3_1: build failure on 10.5.8
-----------------------------+--------------------------------
 Reporter:  michael.klein@…  |      Owner:  macports-tickets@…
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.1.3
 Keywords:                   |       Port:  gtkmm
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 {{{No rule to make target `reference/html/aboutdialog1.png', needed by
 `all-local'.  Stop.}}}

 p5.12-xml-parser is installed (#38956)

 Build log is attached

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Ticket URL: <https://trac.macports.org/ticket/38979>
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