in speech-dispatcher recipe. This adds a dependency on libdotconf target recipe so that it makes it to the sysroot of the speech-dispatcher recipe at build time.
I had a quick glance at your layer and it seems you're targeting kirkstone release but you're still using the old override syntax. Please read https://docs.yoctoproject.org/migration-guides/migration-3.4.html#override-syntax-changes (and the migration guides of all releases between the one supported by the original recipe you got speech dispatcher from so that all required changes are made).
E.g. it's not FILES_${PN} anymore but FILES:${PN}.