Olivier:

Now that things as settled around, and now that I'm good with the
website French translation, I'm taking back the packaging of Cin-GG for
my audio-linux debian-based distribution (and maybe later, a potential
inclusion into Debian mainstream, but... one step after another).
When you do get this packaged with audio-linux LibraZiK, it would be good to add this to cinelerra-gg.org same as AV Linux and Bodhi Linux.

Doing that, I found a bunch of LV2 plugins which are avoided Cin to be
launched and then, which needs to be added to the LV2_blacklist.txt file
(after I did that locally, Cin is launching fine). Those following lines
are the culprits:

file:///usr/lib/lv2/MonoEffect.ingen/MonoEffect.ttl
file:///usr/lib/lv2/MonoInstrument.ingen/MonoInstrument.ttl
file:///usr/lib/lv2/StereoEffect.ingen/StereoEffect.ttl
file:///usr/lib/lv2/StereoInstrument.ingen/StereoInstrument.ttl
http://example.org/raffo
http://www.wodgod.com/newtonator/1.0
https://sami.boukortt.com/plugins/intersect#Intersect
https://sami.boukortt.com/plugins/intersect#SymmetricDifference
https://sami.boukortt.com/plugins/intersect#Upmix
The latest GIT checkin a few minutes ago, includes the updated lv2_blacklist.txt with the first 4 lines BUT I could not test it.  You already did so it should be fine.  HOWEVER, I do not understand the last 5 URL lines.  None of them worked for me and I am confused as to why they were included.

Also, please, find attached an improved version for the
./blds/debian/control file which contains those improvements/changes:
At the end of the month, GG is really pressed for time doing all of the distros.  He is not very good at Debian system packaging/maintenance -- we work on Fedora.  Today he is trying to jam in some changes that got put off while working on the update of OpenGL.  We will save your "control" file and work on looking more carefully at your suggested improvements.  He did take the time to evaluate it, found the duplicate libraries that your control file pointed out and the libusb missing one and alphabetized all of the dependencies to make it easier to find a specific one.  The reason for not listing them one per line despite the fact that it is more human-readable is that just like cpu-s, memory, and disks, the screen is a resource -- most people do not think of that as such, but when you are working with several windows on several program routines simultaneously, you need space. So he really needs to see fewer lines to get to the one he needs to see.  Also, time is a big factor and when he does all of the monthly builds, he uses xen and he has to edit a bunch of individual files before starting to get the builds to work and wants to quickly find the lines he has to modify in each.

Their are some real experts on package control for all of the distros -- in the commercial world where he used to work, there was a "builder" who took care of all of this type of stuff.  We are using bare bones / old stuff just to manage.  Maybe some day, a Cinelerra builder will show up and take care of all of this!

-- why is inkscape needed for building ? It sounds like a mistake at a first glance.
There is a plugin called SVG for Inkscape so that is why it is needed. 
-- why is e2fsprogs needed ?
We did not find the exact reason -- i think it is for mount bluray - I will see if I can find out for sure but at any rate he does not want to take it out until we are sure.
-- same for linux-firmware, why is that needed for building ?
The main reason for this is supposed to be OpenGL + the TV tuner _ hardware.  I will look at this again too since you say it is not even in the Debian repository anymore.
- The "Standards-Version" number is currently defined to "5.1.20190430".
It is not supposed to be the program version number (which is defined in
the debian/changelog file), but a number matching a Debian standard. If
you're OK with that, I would set it up to 3.9.8 which is the standard
for Debian Stretch (current stable - Debian 9) and which will work as
well for the next stable (Buster - Debian 10).
Every month when gg does a build for Debian, it errors out UNLESS he change the Standards-Version in the control file -- so we are surprised that he could put this at 3.9.8 and it would work, month after month.  Again, this may be because of xen.  Also, this is why he leaves this line at the beginning of the file -- to make it easy to find to change it.

Thanks for all of your input.  If I find out anything more, I will let you know.  gg/Phyllis