[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
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 Reporter:  DS-GPS                       |      Owner:  (none)
     Type:  defect                       |     Status:  new
 Priority:  Normal                       |  Milestone:
Component:  ports                        |    Version:  2.7.1
 Keywords:  proftpd clag linker symbols  |       Port:  proftpd
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 When attempting to install ProFTPd, it fails with {{{clang: error: linker
 command failed with exit code 1}}} due to the error {{{ld: symbol(s) not
 found for architecture x86_64}}}

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