> why does a package from official repositories mentions what version of
> a dependency is required?
Because it may be that it is working only with that particular
version. The two common scenarios are:
1) The package requires protocol/API/ABI/header/etc-level
compatibility. You may see this like: foo=a.b.c and bar=a.b.c
are coming together.
2) The package requires newer API (≥X), but it is also known
that available versions newer than X have some bug that
prevent the package from working (≤X). Effectively one
gets =X in requirements.
It seems that you case is the first one.
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