Builders are blocked on master bug 868204

Builders are mirrored (https://ci.chromium.org/p/nacl/g/try/builders) but mostly are red or purple. 

Pending hinoka@ to review and hand off to dschuff@. Updates to follow. 

Builder has been mirrored to LUCI (https://ci.chromium.org/p/nacl/g/try/builders) but unfortunately, it's failing in gn_compile_64 on not being able to find XCode developer SDK. See errors below: 

OSError: [Errno 2] No such file or directory: '/Library/Developer/CommandLineTools/Platforms/MacOSX.platform/Developer/SDKs'
xcode-select: error: unable to get active developer directory, use `sudo xcode-select --switch path/to/Xcode.app` to set one (or see `man xcode-select`)

Assigning to tandrii@ via round robin to help take a look at this to fix. Thanks!

Sergey, have you see something like this before on Chromium bots?

And, do you have suggestion for best way to get xcode working here?

Is this helpful for this builder - https://chrome-internal.googlesource.com/infra/infra_internal/+/master/doc/troopers/playbooks/common.md#Xcode-is-missing-on-Mac-bots ?

Sergey, it was perfect. Thanks!

efoo@ this now goes to compile and fails there because of some clang issue:
https://ci.chromium.org/p/nacl/builders/luci.nacl.try/nacl-mac-newlib-dbg-asan/12

however, it appears to fail on buildbot, too in the same step also due to something wrong/missing with clang:
https://ci.chromium.org/buildbot/client.nacl/mac-newlib-dbg-asan/321 

Thus, back to you to either declare it as good enough on LUCI (i vote for this) or find domain expert to fix.

Build removed. Marking as fixed. Buildbot decom will happen when we turn off the masters.