Driveworks failed Installation

Hallo,

When I try to install Drivworks SDK, I get an error:

CMake error at CMAkeLists.txt:64 (add_subdirectory):

add_subdirectory given source “src/maps” which is not an existing directory.
Configuring Incomplete, errors occurred. Similarly I get the errors for all the other modules like freespace, stereo etc…

Please help.