trying to sort out the vectormath include path mess:

move vectormath to src folder, and add a vmInclude.h that contains the logic in a single location.
If you still need a system-wide vectormath, make sure to define USE_SYSTEM_VECTORMATH (in build system)

Demos/DX11ClothDemo/cloth_renderer.cpp

@@ -21,7 +21,7 @@
 #include "BulletSoftBody/btSoftRigidDynamicsWorld.h"
 #include "BulletMultiThreaded/GpuSoftBodySolvers/DX11/btSoftBodySolverVertexBuffer_DX11.h"
 #include "BulletSoftBody/btSoftBodyHelpers.h"
-#include "vectormath_aos.h"
+#include "vectormath/vmInclude.h"
 
 class btDefaultSoftBodySolver;
 class btCPUSoftBodySolver;