[tor-bugs] #17732 [Tor]: Document required build tool versions

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#17732: Document required build tool versions
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     Reporter:  cypherpunks  |      Owner:
         Type:  defect       |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Tor          |    Version:  Tor: unspecified
     Severity:  Minor        |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 I cannot find the minimum version of Autoconf that Tor should support.
 This makes it difficult to improve upon the build configuration without
 accidentally using functionality not supported by older versions of
 Autoconf.

 My suggestions are to
 * use `AC_PREREQ` in `configure.ac`.
 * move `AUTOMAKE_OPTIONS` from `Makefile.am` to `configure.ac` to have all
 the version configuration in one file.
 * document the versions in one of the `doc/HACKING` files.

 I am willing to write a patch with these changes if someone could tell me
 the minimum Autoconf version Tor should support.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17732>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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