David Craven <da...@craven.ch> skribis:

> What are valid reasons to propagate inputs?

If an installed .h file of spice-gtk #includes a .h file of a
dependency, that dependency should be a propagated input.  Likewise if
its .pc file “Requires” the .pc file of a dependency.

For additional examples, see:

  https://www.gnu.org/software/guix/manual/html_node/package-Reference.html

HTH!

Ludo’.

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