Things to do before making a release:
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Update the version number and release date in configure.ac.
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Update the OCTAVE_API_VERSION number in configure.ac.
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Update version number and release year in CITATION.
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Update the etc/NEWS.N.md file corresponding to the major release number N. Include release date in Summary header.
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Update the NEWS-.html, index.in, news.in, and download.in files for the web site.
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Copy tarballs to ftp.gnu.org.
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Post a release announcement to the [email protected] and [email protected] lists.
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Update https://wiki.octave.org/Release_History page.