Latest commit 55160cf Dec 11, 2016 @jobermayr jobermayr committed with wwmayer Support for NETGEN 6.2.
Upstream changed:
https://sourceforge.net/p/netgen-mesher/git/ci/7e4892a

There is also a pending request to fix NETGEN build, installation and version detection after 6.1:
https://sourceforge.net/p/netgen-mesher/git/merge-requests/1/

Just a note:
NETGEN development happens on https://gitlab.asc.tuwien.ac.at/jschoeberl/netgen but it is a very hard/strange way to find that out and get in contact with NETGEN developers as well as getting permission to fork the repository there to create a pull request.
Maybe some other developer can get in contact with NETGEN developers ...
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