On a related note, why ship the .la files at all?  Linux doesn't need em, and
they just cause problems like this. :)

Fixed.

Removing .la files will not fix these problems, only hide. Autobuild system does
not include all dependencies automatically. It means, that if any dependent
package is missing, with .la file it will fail, without .la file it will create
unprelinkable library. But yes, .la files should be discussed in future. I wrote
an Autobuild check, but it now issues only warnings on this problem.

And package build will still fail on missing includes.