The space navigator stopped working, this hopefully will fix it.
The framework is 3DconnexionClient.framework for osx, not sure why connexion named it that way. It is a library in /Library/Frameworks, the library name is in stone.
for apple, this works in cmake/modules/Find3DConnexionClient.cmake
find_library(3DConnexionClient 3DconnexionClient)
And for windows it has to find the I3dMouseParams.h file in interface/external/3dconnexionclient/includes.
So for windows the line in Find3DConnexionClient.cmake has to be:
hifi_library_search_hints("3dconnexionclient")