Bug#972394: likely cause: Python.h not found because of version mismatch 3.8 vs 3.9

[Adrian Bunk]

On Sun, Oct 25, 2020 at 10:22:47PM +0100, Stephen Sinclair wrote:
> On Wed, Oct 21, 2020 at 10:39 AM Adrian Bunk <bunk at debian.org> wrote:
> >
> > Control: retitle -1 siconos FTBFS with more than one supported python3 version
> >
> > On Mon, Oct 19, 2020 at 11:38:42PM +0200, Markus Koschany wrote:
> > >
> > > I built siconos in a clean chroot environment. The recent rebuild of
> > > siconos also shows build failures
> > >
> > > https://buildd.debian.org/status/package.php?p=siconos
> > >
> > > I don't think it's specific to my environment.
> >
> > You need something like python3-dev -> python3-all-dev in the build
> > dependencies.
> 
> I can confirm that making this change allows the package to build.
> However, some Python-related tests in autopkgtest fail when trying to
> import the Siconos python modules, so something still needs to be
> fixed.  I will investigate.
> As for this change, however, is it the correct one to make?  Or should
> I wait for more information in #972551?
> 
> > The next problem is what it builds - it then builds for the highest
> > version only, not for the default version.
> 
> Can I ask how you determined this?
>...

I ran debdiff between the package in the archive and the package
I built myself.

The lack of 3.8 modules in the package also explains your problem.

> regards,
> Steve

cu
Adrian