Bug#1118744: missing python3-numpy build dependency

[Miao Wang]

Hi, all

I also met this problem. I found that the problem involves imath and numpy.

After numpy 1:2.2.3+ds-3, the dh_numpy3 script added a behavior[1] to dig into
debian/<binpkg-name> to look for shared libraries referring numpy capi, and
only add the dependency if there is at least one. In imath, however, dh_numpy3
is invoked before dh_install [2]. As a result, python3-imath built from imath
with numpy3 no older than 1:2.2.3+ds-3 will lack the dependency to
python3-numpy.

Opencv B-D python3-imath, and as a result, if it is built with a rebuilt
version of imath, it will FTBFS with missing dependency to python3-numpy.
However, the current version of imath in sid was built with 1:2.2.2+ds-2,and
is not affected by the change of dh_numpy3, so trying to rebuild either package
of imath opencv individually cannot detect this issue.

Cheers,

Miao Wang

[1]: https://salsa.debian.org/python-team/packages/numpy/-/commit/507300db7472ffc437d60432c385394fcf21ffde
[2]: https://sources.debian.org/src/imath/3.1.12-1/debian/rules#L32