Comment 2 for bug 1670146

Based on a chat with Tim my understanding is that this is about building against a Qt version that's in a part but not in the archives. The Liri Calculator uses the LiriOS platform snap¹ which is based on Qt 5.8 which isn't in the archive, and apps must be built against the same headers. The platform snap doesn't provide any header files. The same problem exists with the upstream Qt 5.8 snap² that Timo made.

[1] https://github.com/lirios/platform-snap/blob/develop/snap/snapcraft.yaml
[2] https://github.com/tjyrinki/qt58