[MacPorts] #61883: libgcc7 @7.5.0: build failure on macOS 11

[MacPorts]

#61883: libgcc7 @7.5.0: build failure on macOS 11
------------------------+--------------------
  Reporter:  YuncongMa  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  libgcc7    |
------------------------+--------------------

Comment (by kencu):

 you should be using pdftk-java, not pdftk, on all newer systems.

 We'll have to adjust the blockers and warnings so that happens.

 gccj is not going to be made to work on BigSur; upstream gcc dropped it
 years ago.

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Ticket URL: <https://trac.macports.org/ticket/61883#comment:13>
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