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

[MacPorts]

#59244: librsvg fails to build on macOS 10.15 Catalina
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  Reporter:  kotashiratsuka  |      Owner:  dbevans
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.1
Resolution:                  |   Keywords:
      Port:  librsvg         |
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Comment (by kotashiratsuka):

 #comment:3

 port extract -> patch & json checksum update in workdir -> port build ->
 port install -> install success!!

 I wanted to use imagemagick.

 Great!!

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Ticket URL: <https://trac.macports.org/ticket/59244#comment:7>
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