This error
/Users/christian/sources/cpp/Builds/Slicer/Release/Slicer-build/lib/Slicer-4.9/qt-loadable-modules/./libvtkSlicerMarkupsModuleMRMLDisplayableManagerPythonD.dylib: malformed mach-o: load commands size (32840) > 32768
seems to be due to the limit on total size of all the load commands in the dynamic library in the MacOS loader.
I guess using a shorter build directory path would solve the issue. For example, instead of /Users/christian/sources/cpp/Builds/Slicer/Release, you could try /Users/christian/D/S4R.