Using cmake, the vdt dirs (in include and math) are not being created during the configuration.
Building the libraries fails at:
Scanning dependencies of target ROOTVecOps
[ 88%] Building CXX object math/vecops/CMakeFiles/ROOTVecOps.dir/G__ROOTVecOps.cxx.o
[ 88%] Building CXX object math/vecops/CMakeFiles/ROOTVecOps.dir/src/RAdoptAllocator.cxx.o
[ 88%] Building CXX object math/vecops/CMakeFiles/ROOTVecOps.dir/src/RVec.cxx.o
make: *** No rule to make target `lib/libvdt.dylib', needed by `lib/libROOTVecOps.so'. Stop.
make: *** [math/vecops/CMakeFiles/ROOTVecOps.dir/all] Error 2
make: *** [all] Error 2