Can't find buildconf for compiling PHP

I am trying to build PHP but "buildconf" is not found.

I am using Windows 10 and Visual Studio 2015 Community. I am trying to 
build PHP using:

    Build your own PHP on Windows
    https://wiki.php.net/internals/windows/stepbystepbuild

I downloaded:

    . VC14 x64 Non Thread Safe (2016-Sep-14 02:01:04) from:
    PHP For Windows: Binaries and sources Releases
    http://windows.php.net/download

    . php-sdk-binary-tools-20110915.zip from:
    windows.php.net - /downloads/php-sdk
    http://windows.php.net/downloads/php-sdk

    . deps-7.1-vc14-x64.7z from:
    windows.php.net - /downloads/php-sdk
    http://windows.php.net/downloads/php-sdk

This configuration will only be used by me, will get only minimal use 
and I don't need to support multiple versions of PHP source so for the 
lowest level of the directory structure I am just using "source". My 
source therefore is currently in:

C:\php-sdk\phpdev\vc14\x64\source

Step 4 of "Compile" says to execute "buildconf" but I don't find that 
anywhere. As best as I can tell, that command will not exist regardless 
of what I use for the source directory (as in the preceding) so I assume 
there is something else I am missing. I have tried to search for 
something saying where "buildconf" comes from and all I can find is that 
it uses "autoconf" and "autoconf" does not exist anywhere in the 
"C:\php-sdk" directory and subdirectoreis. I used Windows Explorer (that 
explores the file system, not windows) to search for anything named 
"buildconf" or "autoconf". If someone knows which of the three downloads 
(the source, the tools or the dependencies) that "buildconf" comes from 
or where it is supposed to exist then that will help. I suspect that 
something is missing, either from a download or from the instructions.

I assume that Step 5 of "Setup the build directory" means that I need to 
copy the vc9 directory to another directory and rename the other 
directory to vc14.