help with animatewindow()

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/animatewindow.asp

this is the msdn article on the windows api function AnimateWindow(). it claims to be "defined in winuser.h, include windows.h" (scroll all the way down), but when i attempt to compile the attached program, AnimateWindow(), AW_ACTIVATE, and, AW_HIDE are apparently undefined. perhaps i have an old version of windows.h or winuser.h? i am using dev-c++ beta 5. can someone help, either what am i doing wrong or where can i get an updated version of these all-important header file(s).

thanks in advance

EDIT: upon examining my windows.h and winuser.h files, i have determined that AnimateWindow(), AW_HIDE, and AW_ACTIVATE are all defined. if anyone is interested, those header files are now attached as well (note winuser.h is zipped because it is too large to upload uncompressed). (dev-c++ is free, so i shouldn't be breaking any laws by doing this, someone tell me if i am and i will immediately remove the files)

found the answer

i needed to #define WINVER and _WIN32_WINNT

(http://www.gidforums.com/showthread.php?p=22326)