Compilation failure of version 6.14

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[2]: *** No rule to make target `lib/libvdt.dylib', needed by `lib/libROOTVecOps.so'.  Stop.

make[1]: *** [math/vecops/CMakeFiles/ROOTVecOps.dir/all] Error 2

make: *** [all] Error 2