[MacPorts] #59244: librsvg fails to build on macOS 10.15 Catalina

[MacPorts]

#59244: librsvg fails to build on macOS 10.15 Catalina
-----------------------------+----------------------------
  Reporter:  kotashiratsuka  |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.1
Resolution:                  |   Keywords:  catalina 10.15
      Port:  librsvg         |
-----------------------------+----------------------------

Comment (by mf2k):

 In the future, please add the port maintainer(s) to Cc ({{{port info
 --maintainers librsvg}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/59244#comment:1>
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