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/usr/share/doc/patch/AUTHORS is in patch 2.7.1-4.

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Larry Wall wrote the original version of `patch'.

Paul Eggert removed arbitrary limits; added support for binary
files, setting file times, and deleting files; and made it conform
better to POSIX.

Wayne Davison added unidiff support.

David MacKenzie added configuration and backup support.

Andreas Gruenbacher added merge support.