This type structure is missing. It should look like this:
typedef enum _D3D_SHADER_VARIABLE_FLAGS {
D3D_SVF_USERPACKED = 1,
D3D_SVF_USED = 2,
D3D_SVF_INTERFACE_POINTER = 4,
D3D_SVF_INTERFACE_PARAMETER = 8,
D3D10_SVF_USERPACKED = D3D_SVF_USERPACKED,
D3D10_SVF_USED = D3D_SVF_USED,
D3D11_SVF_INTERFACE_POINTER = D3D_SVF_INTERFACE_POINTER,
D3D11_SVF_INTERFACE_PARAMETER = D3D_SVF_INTERFACE_PARAMETER,
D3D_SVF_FORCE_DWORD = 0x7fffffff
} D3D_SHADER_VARIABLE_FLAGS;