Also affects tensorflow build itself. See: 
https://trac.macports.org/ticket/62474

> On Mar 17, 2021, at 10:05 AM, Steven Smith <[email protected]> wrote:
> 
> I’m trying to build a bunch of tensorflow and related ports whose upstreams 
> use the wonderful bazel build system.
> 
> These used to work a few months ago, but now are all throwing the error below.
> 
> Does anyone know how to resolve this issue.
> 
> E.g. see:
> https://github.com/macports/macports-ports/pull/10294 
> <https://github.com/macports/macports-ports/pull/10294>
> https://github.com/macports/macports-ports/pull/10295 
> <https://github.com/macports/macports-ports/pull/10295>
> …
> 
> sudo port -dv test py39-dm-tree
> 
>> ERROR: 
>> /opt/local/var/macports/build/_opt_local_ports_python_py-dm-tree/py39-dm-tree/work/d8451668cbe25ab61b4db805f3a8f026/external/com_google_absl/absl/base/BUILD.bazel:119:11:
>>  C++ compilation of rule '@com_google_absl//absl/base:base' failed: I/O 
>> exception during sandboxed execution: xcrun failed with code 1.
>> This most likely indicates that SDK version [10.15] for platform [MacOSX] is 
>> unsupported for the target version of xcode.
>> Process exited with status 1
>> stdout: stderr: xcodebuild: error: SDK "macosx10.15" cannot be located.
>> xcodebuild: error: SDK "macosx10.15" cannot be located.
>> xcrun: error: unable to lookup item 'Path' in SDK 'macosx10.15'
>> Target //tree:_tree failed to build
> 
> 
> 

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