Hi,

In ISAR v0.9 we were able to use build dependencies from the backports repository:


  1.  Add the backports repo to DISTRO_APT_SOURCES
  2.  Write an apt preferences file to prefer the backports package and add it to DISTRO_APT_PREFERENCES

This still works for runtime dependencies, but not for build dependencies.
The sbuilder simply does not attract the package from backports as they have "NotAutomatic: yes".

Maybe we could work around by using ` --build-dep-resolver="apt"`.
But then more questions arise:
- are the DISTRO_APT_SOURCES added as -external-repository? I don't think so
- when creating the base-schroot: Is the repo considered (and are DISTRO_APT_PREFERENCES active)
- are the DISTRO_APT_PREFERENCES files added to the schroot?

Help wanted.

Felix
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