ghc 8.6.3 fails to build on macOS Sierra, High Sierra and Mojave (10.12 to 10.14)

We at Homebrew are trying to upgrade the ghc version we ship to 8.6.3. However, many test failures are occurring: https://github.com/Homebrew/homebrew-core/pull/35773

SUMMARY for test run started at Tue Jan  8 18:16:47 2019 GMT
 0:55:14 spent to go through
    6521 total tests, which gave rise to
   25300 test cases, of which
   18851 were skipped

      28 had missing libraries
    5900 expected passes
      90 expected failures

       0 caused framework failures
       0 caused framework warnings
       1 unexpected passes
     422 unexpected failures
       8 unexpected stat failures

I am attaching the full build output.

Trac metadata

Trac field	Value
Version	8.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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