Problems compiling under FC4

I've installed the kernel-devel package, and the latest cvs code. I
get the following errors after doing "make usb":

  CC [M]  /home/lrs/tmp/atmelwlandriver/objs/usbvnetr/debug/rx.o
/home/lrs/tmp/atmelwlandriver/objs/usbvnetr/debug/rx.c: In function 'MgmtFrameProcessing':
/home/lrs/tmp/atmelwlandriver/objs/usbvnetr/debug/rx.c:753: error: invalid lvalue in assignment
make[3]: *** [/home/lrs/tmp/atmelwlandriver/objs/usbvnetr/debug/rx.o] Error 1
make[2]: *** [_module_/home/lrs/tmp/atmelwlandriver/objs/usbvnetr/debug] Error 2
make[2]: Leaving directory `/usr/src/kernels/2.6.12-1.1398_FC4-i686'
make[1]: *** [all] Error 2

Do anyone knows what the problem is caused of?

Lars