i was following the tutorial 1 in dark GDK and i was debugging and the output saild
1>------ Build started: Project: hello world, Configuration: Debug Win32 ------
1>Compiling...
1>Main.cpp
1>c:\program files (x86)\the game creators\dark gdk\include\darksdkcamera.h(16) : fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1>Build log was saved at "file://c:\Users\Dubeau Family\Documents\Visual Studio 2008\Projects\hello world\hello world\Debug\BuildLog.htm"
1>hello world - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
help