sbuild of python2.7 - fails for crazy dependencies

[Riccardo Mottola <riccardo.mottola@libero.it>]

Hi,

brief summary:

---

sudo sbuild-createchroot unstable debian-powerpc --arch=powerpc 
--include=debian-ports-archive-keyring --keyring 
/usr/share/keyrings/debian-ports-archive-keyring.gpg 
http://ftp.ports.debian.org/debian-ports

dget 
-uhttp://snapshot.debian.org/archive/debian/20220801T085926Z/pool/main/p/python2.7/python2.7_2.7.18-13.2.dsc
cd python2.7

sbuild -d unstable --arch-all --arch=powerpc python2.7_2.7.18-13.2.dsc

----

sbuild fails with:

(I)Dose_deb: Parsing Packages file -...
(I)Dose_common: total packages 85357
(I)Dose_applications: Cudf Universe: 85357 packages
(I)Dose_applications: --checkonly specified, consider all packages as 
background packages
(I)Dose_applications: Solving...
output-version: 1.2
native-architecture: powerpc
report:
 -
  package: sbuild-build-depends-main-dummy
  version: 0.invalid.0
  architecture: powerpc
  status: broken
  reasons:
   -
    missing:
     pkg:
      package: libgl1-mesa-dri
      version: 24.0.6-1+b1
      architecture: powerpc
      unsat-dependency: libllvm17t64:powerpc
     depchains:
      -
       depchain:
        -
         package: sbuild-build-depends-main-dummy
         version: 0.invalid.0
         architecture: powerpc
         depends: xvfb:powerpc
        -

         package: xvfb
         version: 2:21.1.12-1
         architecture: powerpc
         depends: libgl1:powerpc
        -
         package: libgl1
         version: 1.7.0-1
         architecture: powerpc
         depends: libglx0:powerpc (= 1.7.0-1)
        -
         package: libglx0
         version: 1.7.0-1
         architecture: powerpc
         depends: libglx-mesa0:powerpc
        -
         package: libglx-mesa0
         version: 24.0.6-1+b1
         architecture: powerpc
         depends: libgl1-mesa-dri:powerpc

background-packages: 85356
foreground-packages: 1
total-packages: 85357
broken-packages: 1

+------------------------------------------------------------------------------+
| Cleanup |
+------------------------------------------------------------------------------+

Purging /<<BUILDDIR>>
Not cleaning session: cloned chroot in use
E: Package build dependencies not satisfied; skipping


but I want to build only python! I can understand some technical 
dependencies on libraries and compilers... but mesa? llvm? I think 
something is trying to build world.

Do I miss some parameters to limit the scope?

Riccardo