[MacPorts] #70673: autoconf fails on Linux if help2man not installed, but no dependency on it

[MacPorts]

#70673: autoconf fails on Linux if help2man not installed, but no dependency on it
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  larryv
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.1
Resolution:                |   Keywords:  linux
      Port:  autoconf      |
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Comment (by barracuda156):

 It is strange why Linux (at least my Linux here) wants it. FreeBSD does
 not declare any dependency on `help2man` either, for example:
 https://github.com/freebsd/freebsd-
 ports/blob/06757954d9e3de9472361b4e8db6ffb991c8dcea/devel/autoconf/Makefile
 It should not be needed, but I still cannot build `autoconf` on Linux due
 to `help2man` (I finally got it building, but there is an error when
 autoconf build script invokes help2man).

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Ticket URL: <https://trac.macports.org/ticket/70673#comment:5>
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