[MacPorts] #59783: groff-1.22.4: build fails on 10.6 (clang-9.0, libc++): #error "Please include config.h first."

[MacPorts]

#59783: groff-1.22.4: build fails on 10.6 (clang-9.0, libc++): #error "Please
include config.h first."
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by jmroot):

 It has a header called math.h in the search path (`-I./lib`). It can only
 be by pure luck that this hasn't caused problems with earlier compiler
 versions.

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Ticket URL: <https://trac.macports.org/ticket/59783#comment:5>
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