Just in case, if someone else is trying to do this just recently ...
Cygwin now uses OpenSSL 1.1 and the source code is ipmitool 1.8.12 and the cygwin version mentioned in Ashok's answer above is supposed to be OpenSSL 1.0.
This may be fixed in the next release of 1.8.19, but as of 1.8.18 it is not, so you have to download the latest source from GitHub: https://github.com/ipmitool/ipmitool (they moved from SourceForge)
In addition, you need to install also from cygwin_setup:
Then you can run
cd ipmitool-master/ ; ./bootstrap && ./configure && make
(now the default configuration includes the lanplus plugin)
I did not try to copy the cygwin libraries to another machine as the solution mentioned, but if you want to do this, you will need cygcrypto-1.1.dll instead of 1.0 above.
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