CYGWIN enviroment conflicts with autoconf configure scripts

[Assar Westerlund]

Wayne Scott <wscott@bitmover.com> writes:
> Unfortunately it is also used as a temporary variable in the autoconf
> script and so as soon as configure resets the CYGWIN variable, it was
> unable to run 'gcc' anymore.

It's only set by the (now obsolete) AC_CYGWIN macro.

> Autoconf needs to be changes to not trash the CYGWIN variable when
> running it's tests.  And Cygwin developers need to beware of this
> problem when trying to build programs.
>
> autoconf v2.13

You need to update autoconf and migrate away from obsolete macros.

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