[MacPorts] #63386: R-app does not build on MacOS 11

[MacPorts]

#63386: R-app does not build on MacOS 11
---------------------------+--------------------
 Reporter:  LenoreHorner   |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.7.99
 Keywords:  R-app Big Sur  |       Port:
---------------------------+--------------------
 Error: Failed to build R-app: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_math_R-app/R-app/main.log for
 details.

 Clean install of Big Sur.  Install Macports from scratch and install
 ports.  R builds but R-app does not.  Attempting to attach log noted
 above.

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Ticket URL: <https://trac.macports.org/ticket/63386>
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