[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 ken-cunningham-webuse):

 In [changeset:"aad24861aa65e29ce3bb705dc91192206c6eb978/macports-ports"
 aad24861aa65e29ce3bb705dc91192206c6eb978/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="aad24861aa65e29ce3bb705dc91192206c6eb978"
 pdftk: mark obsolete on newer systems

 see: https://trac.macports.org/ticket/61883
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61883#comment:15>
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