Lintian tag information: version-substvar-for-external-package (type: error)

Description (from lintian-explain-tags)

The first package has a relation on the second package using a
dpkg-control substitution variable to generate the versioned part of the
relation. However the second package is not built from this source
package. Usually this means there is a mistake or typo in the package name
in this dependency.

Visibility: error
Show-Always: no
Check: debian/version-substvars

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