[MacPorts] #62474: tensorflow build fails on 10.15

[MacPorts]

#62474: tensorflow build fails on 10.15
-----------------------+---------------------------
 Reporter:  essandess  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:             |       Port:  py-tensorflow
-----------------------+---------------------------
 {{{sudo port install py39-tensorflow}}}

 {{{
 :info:build ERROR:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_python_py-
 tensorflow/py39-tensorflow/work/846a2d310fd0286a6b86467e524348b4/external/com_google_protobuf/BUILD:301:11:
 C++ compilation of rule '@com_google_protobuf//:protoc_lib' failed due to
 Exec failed due to IOException: xcrun failed with code 1.
 :info:build This most likely indicates that SDK version [10.15] for
 platform [MacOSX] is unsupported for the target version of xcode.
 :info:build Process exited with status 1
 :info:build stdout: stderr: xcodebuild: error: SDK "macosx10.15" cannot be
 located.
 :info:build xcodebuild: error: SDK "macosx10.15" cannot be located.
 :info:build xcrun: error: unable to lookup item 'Path' in SDK
 'macosx10.15'
 :info:build java.io.IOException: xcrun failed with code 1.
 :info:build This most likely indicates that SDK version [10.15] for
 platform [MacOSX] is unsupported for the target version of xcode.
 :info:build Process exited with status 1
 :info:build stdout: stderr: xcodebuild: error: SDK "macosx10.15" cannot be
 located.
 :info:build xcodebuild: error: SDK "macosx10.15" cannot be located.
 :info:build xcrun: error: unable to lookup item 'Path' in SDK
 'macosx10.15'
 :info:build     at
 com.google.devtools.build.lib.exec.local.XcodeLocalEnvProvider.querySdkRoot(XcodeLocalEnvProvider.java:150)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62474>
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