Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [+ autoreconf -f -i
configure.ac:1: error: Autoconf version 2.71 or higher is required]: [Running the autoreconf tool failed.]

Issue: The configure.ac file has been processed by autoconf version older than 2.71.
Resolution: Ensure the autoconf package version 2.71 or newer is available in the buildroot.