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-- The current Nauty library is very picky about the Graph.pm module
version. Version 0.96 (default Debian package for LinuxMint-19) is
reported as too old, but the 0.9721 version (default in CPAN as of
writing of this note) brings with it the Set::Object dependency and
Object.so implementation, and causes Nauthy.so (and thus some
automatic tests) to segfault. Only the Graph-0.9704 version
(default on Linuxmint-20.1) works. Given that the incompatibility
of Nauty with the 0.9721 version of the Graph is not diagnosed, the
failing tests leave a lot of guessing as to whether the package is
operational.
More accurate Nauty (probably Nauty.so) compatibiliy diagnostics
and adaptation is desirable.
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