[MacPorts] #65759: librsvg @2.54.4: build fails for big sur; doc generation fails

[MacPorts]

#65759: librsvg @2.54.4: build fails for big sur; doc generation fails
----------------------+----------------------
  Reporter:  M-Rick   |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.2
Resolution:           |   Keywords:
      Port:  librsvg  |
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Comment (by M-Rick):

 Replying to [comment:7 mascguy]:
 > Ah, from the logs, I just noticed you installed MacPorts in a custom
 location:
 >
 > `/opt/local/gnome`
 >
 > And while that shouldn't cause any technical problems, there is one
 major consequence: Every single package must be built from source.
 >
 > Was that intentional?
 Yes because I didn't want to break my existing MacPorts installation.

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Ticket URL: <https://trac.macports.org/ticket/65759#comment:11>
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