[MacPorts] #63343: proftpd @1.3.6e: Fails to Build on MacOS 11.4

[MacPorts]

#63343: proftpd @1.3.6e: Fails to Build on MacOS 11.4
----------------------+-----------------------------------------
  Reporter:  DS-GPS   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:  proftpd clag linker symbols
      Port:  proftpd  |
----------------------+-----------------------------------------

Comment (by kencu):

 There is a fairly easy-to-implement BigSur fix for libtool that looks like
 it would be needed here.

 Here is a recent patch I made for this in another port.

 https://github.com/macports/macports-
 ports/commit/5e7bfe892e295d484146371b50780eaddbc1d40e

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Ticket URL: <https://trac.macports.org/ticket/63343#comment:1>
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