https://cinelerra-gg.org/download/CinelerraGG_Manual.pdf
http://g-raffa.eu/Cinelerra/HOWTO/basics.html
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+2022 June - there are no changes of note
2022 May changes of note:
OpenJPEG upgraded from 2.4.0 to 2.5.0
Many Makefile build changes incorporated for less used O/S-s.