Cygwin

• Perl CPAN install command does not work. Do this instead.

Download the module.
Unzip it.
perl Makefile.PL 
make
make install

OpenSSL for Windows OS

OpenSSL[1]

Get the git open source.

Install from C:\openssl-master to C:\OpenSSL

Read NOTES.WIN, INSTALL.md

Run below in a visual studio developer prompt.
$ perl Configure VC --prefix=C:\OpenSSL
$ nmake all // lib and docs
$ nmake test
$ nmake install

Install target is:
C:\Program Files (x86)\OpenSSL
SET OPENSSL_CONF=C:\OpenSSL\bin\openssl.cfg
but that was not created.

Set Environmental Variable, OpenSSL_HOME=C:\OpenSSL
Add to PATH C:\Program Files (x86)\OpenSSL\bin
stackoverflow answer[2]

--openssldir=C:\Program Files (x86)\Common Files\SSL

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