how do I compile cURL with openSSL and nghttp2 on Windows x64?

Ok, I was finally able to build Curl on Windows with http/2 support.This is what worked for me, step by step:

• Downloaded "Build Tools for Visual Studio 2017" to be able to build from the command line (provides nmake and required Windows SDK libraries and header filtes)
• downloaded the latest version of curl, like stated above (curl-7.56.1.tar.gz, aka for me the very first one on https://curl.haxx.se/download.html)
• extracted it inside c:/curl, so I ended up with c:/curl/curl-7.56.1
• read instructions BUILD.WINDOWS.txt inside c:/curl/curl-7.56.1/winbuild and proceeded to http://windows.php.net/downloads/php-sdk/deps/ to download the 4 libraries that I needed. I just grabbed the VC15/x86 versions.
• created a new folder named "deps" inside c:/curl/curl-7.56.1
• created the following 3 folders inside c:/curl/curl-7.56.1/deps: bin, lib, and include
• extracted each library I just downloaded in the corresponding 3 folders
• opened Developer Command Prompt for VS 2017
• cd c:/curl/curl-7.56.1/winbuild
• nmake -f Makefile.vc mode=dll WITH_DEVEL=c:/curl/curl-7.56.1/deps WITH_SSL=dll WITH_NGHTTP2=dll WITH_ZLIB=static WITH_SSH2=dll
• this builds a CURL executable inside one of the subfolders in c:\curl\curl-7.56.1\builds
• when I first tried running CURL, it showed an error saying missing libssl-1_1.dll and libcrypto-1_1.dll, so I had to copy them from c:\curl\curl-7.56.1\deps\bin to the same directory where the newly built curl.exe is
• Note: since zlib didn't come with a bin folder containing any .dll's, I understand why I had to mark zlib as static with the WITH_ZLIB=static flag. What I don't get is why I had to manually move the openssl .dll's in the new directory. Any thoughts?

PS: thank you Daniel for pointing me in the right direction. I didn't even notice the /winbuild directory.

PPS: As you can probably tell, I had no idea what I've been doing 90% of the time. Probably why it took me 5 days to figure it out ;)