<p></p>
<p>Alright, thanks for all your help. Marcel has explained to me that I need to start cygwin via the <code>cygwin.bat</code> but never must start the <code>bash.exe</code> itself. Now the headers are found and <code>mvm</code> succeeds! <g-emoji class="g-emoji" alias="tada" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f389.png">🎉</g-emoji></p>
<p>I still don't understand why it did work for me via MSVC, but at least I can build now, so everything else is secondary :-)</p>

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