Hi,
Sorry, I will then fall back to the thread mentioned above.
Indeed I feel that I don’t understand the way to package a third-party on the fly and to propagate it through dependencies.
I took inspiration from Daniel Pfeiffer presentation but it seems that I got it wrong.
I don’t understand what’s to be done on the package.
I also read several times the official CMake doc: https://cmake.org/cmake/help/git-stage/guide/importing-exporting/index.html
but, honestly, I could not understand it, especially in the context of third party targets.
I hope that my questions in the other thread may have an answer. I think that it may help a bunch of other peoples to that may otherwise use “workarounds” 
.
Regards
A.