It is also reported here with a solution:
https://bugs.php.net/bug.php?id=58905
Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » https://pecl.php.net/package/xdiff.
A DLL for this PECL extension is currently unavailable. See also the building on Windows section.
It is also reported here with a solution:
https://bugs.php.net/bug.php?id=58905This package currently does not compile on PHP 5.4 and above.
https://bugs.php.net/bug.php?id=60414