[MacPorts] #63085: clang-12: build from source fails on 11.4

[MacPorts]

#63085: clang-12: build from source fails on 11.4
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  Reporter:  blair     |      Owner:  kencu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  clang-12  |
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Comment (by blair):

 Looking through my entire log, I found this line 33% through the build:

 `make[1]: *** [projects/compiler-
 rt/lib/builtins/CMakeFiles/clang_rt.cc_kext_arm64e_osx.dir/all] Error 2`

 I can upload the entire file, it's 3 MB, I'm avoiding doing to not waste
 server space.

 Thanks, adding `use_parallel_build no` got the build to work fine.

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Ticket URL: <https://trac.macports.org/ticket/63085#comment:3>
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