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.
Windows binaries (DLL files) for this PECL extension are available from the PECL website.
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