[GHC] #15769: GHC 8.6 for macOS depends on homebrew

[GHC]

#15769: GHC 8.6 for macOS depends on homebrew
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        Reporter:  kazu-yamamoto     |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.2
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Installing GHC    |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by kazu-yamamoto):

 I installed GHC 8.6.2.

 1) The first problem ("sudo make install") is gone.

 2) But the second problem remains. "ld: library not found for -lgmp"

 I cannot find what kind of assumption is made for libgmp on macOS from the
 manual.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15769#comment:2>
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