Ok this is what I did to build the package (after reading the instructions from Igor and on the debian site):

mkdir gtk3-nocsd
cd gtk3-nocsd
dget --extract --allow-unauthenticated  https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/gtk3-nocsd/3-1ubuntu3/gtk3-nocsd_3-1ubuntu3.dsc
sudo apt build-dep gtk3-nocsd
sudo apt install markdown
cd gtk3-nocsd-3
dpkg-buildpackage --build=binary --no-sign
cd ..

these are the binary packages that got created:

ls -la *.deb
-rw-r--r-- 1 user user 47416 Jul  1 01:16 gtk3-nocsd_3-1ubuntu3_all.deb
-rw-r--r-- 1 user user 56524 Jul  1 01:16 libgtk3-nocsd0-dbgsym_3-1ubuntu3_amd64.deb
-rw-r--r-- 1 user user 16232 Jul  1 01:16 libgtk3-nocsd0_3-1ubuntu3_amd64.deb

To replace the standard Devuan packages with the freshly built ones I ran:

sudo apt remove gtk3-nocsd libgtk3-nocsd0
sudo dpkg -i gtk3-nocsd_3-1ubuntu3_all.deb libgtk3-nocsd0_3-1ubuntu3_amd64.deb

This how Ghex (a gtk4 app) looks like with the standard Devuan gtk3-nocsd packages:
http://pkgrepo.linuxtech.net/files/Ghex-original.png

And this is how it looks like with the packages rebuilt from Ubuntu sources:
http://pkgrepo.linuxtech.net/files/Ghex … -nocsd.png

Unfortunately the result is not what I hoped for, the Ubuntu sourced gtk3-nocsd packages simply remove the CSD (i.e. the program icon on the left and the three windowbar icons on the right) but the SSD doesn't get added, Does anyone know what needs to be done to add the SSD?

BTW, is there no way to attach images to a post on this forum?

Ok, I will try to build the Ubuntu package for Devuan Excalibur and report my findings but I will first have to figure out how to do this so it might take some time, as I'm a complete beginner with regards to building packages on Debian/Devuan (my experience of the last 30 years with Linux has been almost exclusively with various RPM based distros and more recently some Arch based distros).

That article seems like a collection of all the usual buzzwords and expressions a certain political fringe group likes to throw around when they are throwing a tantrum...

It makes me sad to see how immature and brainwashed some people are.

I thought I would add my question here as it's the same topic:
what are Devuans plans with regards to the minimum required x86-64 microarchitecture level? https://en.wikipedia.org/wiki/X86-64#Mi … ure_levels
I hope Devuan is not going to follow IBM/Rehat which introduced the x86-64-v2 requirement for RHEL8 and more recently the x86-64-v3 requirement for RHEL10.
AFAIK Suse has introduced similar requirements and Ubuntu is planning to do the same.

I still have multiple systems based on AMD Phenom II X4 and X6 processors (and one with an Intel Core2Quad cpu) which are all x86-64-v1 but are still perfectly usable (the are equipped with 8 GB and one with 16 GB of ECC RAM) so I hope that by migrating them to Devuan I can still continue using them for many years (not just with Excalibur but also after that).