"Anatol Belski" in php.internals.win (Wed, 5 Aug 2015 17:13:15 +0200):
>What's new is in Win10 SDK -
>https://dev.windows.com/en-us/downloads/windows-10-sdk ... If you read this,
>from anything there PHP requires only UCRT, and it is available by the
>default installation of VS2015 (and receives the updates with it).
>I'm really not sure what is the practical issue you see.
WinSock2.h is not in the UCRT and PHP needs to include it. The practical
issue: where does the build process find it?