Bug#1141054: python3-vtk9 is not installable in unstable because it depends on python3 (<< 3.14)

[Chow Loong Jin]

Package: python3-vtk9
Version: python3-vtk9 is not installable in unstable
Severity: grave
Justification: renders package unusable

Dear Maintainer,

python3-vtk9 is not installable in unstable, which breaks the build of slic3r-prusa:

    E: Unable to satisfy dependencies. Reached two conflicting assignments:
       1. python3-vtk9:amd64 is selected for install because:
          1. sbuild-build-depends-main-dummy:amd64=0.invalid.0 is selected for install
          2. sbuild-build-depends-main-dummy:amd64 Depends libocct-ivtk-dev
          3. libocct-ivtk-dev:amd64 Depends libvtk9-dev
          4. libvtk9-dev:amd64 Depends python3-vtk9 (= 9.5.2+dfsg4-5+b1)
       2. python3-vtk9:amd64 Depends python3 (< 3.14)
          but none of the choices are installable:
          [no choices]

It looks like the `python3 (< 3.14)` constraint comes from
${python:Depends}, so a binNMU might resolve this.

-- System Information:
Debian Release: forky/sid
  APT prefers resolute-updates
  APT policy: (500, 'resolute-updates'), (500, 'resolute-security'), (500, 'resolute')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 7.0.0-22-generic (SMP w/14 CPU threads; PREEMPT)
Kernel taint flags: TAINT_CPU_OUT_OF_SPEC, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_SG.UTF-8, LC_CTYPE=en_SG.UTF-8 (charmap=UTF-8), LANGUAGE=en_SG:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-vtk9 depends on:
ii  libc6           2.43-2ubuntu2
ii  libgcc-s1       16-20260322-1ubuntu1
pn  libopenmpi40    <none>
ii  libpython3.14   3.14.4-1
ii  libstdc++6      16-20260322-1ubuntu1
ii  libtbb12        2022.3.0-2
pn  libvtk9.5       <none>
pn  libvtk9.5-qt    <none>
ii  python3         3.14.3-0ubuntu2
pn  python3-mpi4py  <none>

python3-vtk9 recommends no packages.

Versions of packages python3-vtk9 suggests:
pn  mayavi2        <none>
pn  vtk9-doc       <none>
pn  vtk9-examples  <none>

-- 
Kind regards,
Loong Jin
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://alioth-lists.debian.net/pipermail/debian-science-maintainers/attachments/20260629/19b0b888/attachment.sig>