[openssl-dev] Building OpenSSL on Windows

[Jan Ehrhardt]

Tom Kacvinsky in gmane.comp.encryption.openssl.devel (Tue, 27 Oct 2015
13:15:45 -0400):
>I've seen several messages float by about building OpenSSL on Windows.  My
>understanding is that I'll need a Perl distribution, in addition to a
>specific assembler (MS's Macro Assemble is not up to the task is what I
>gather).  Anything else I need to be aware of?  I will be building in a DOS
>shell with Visual Studio 2008.

Take a look at https://github.com/winlibs/openssl
You will need nasm:

C:\php-sdk>nasm -v
NASM version 2.11.08 compiled on Feb 21 2015
-- 
Jan