Someone

copying file alsa-kernel/usb/usbmidi.c
patching file usbmidi.c
copying file alsa-kernel/usb/usbmixer.c
patching file usbmixer.c
make[3]: Entering directory `/usr/src/alsa-driver-1.0.14rc1/usb/usx2y'
copying file alsa-kernel/usb/usx2y/usX2Yhwdep.c
patching file usX2Yhwdep.c
copying file alsa-kernel/usb/usx2y/usbusx2y.c
patching file usbusx2y.c
copying file alsa-kernel/usb/usx2y/usbusx2yaudio.c
patching file usbusx2yaudio.c
copying file alsa-kernel/usb/usx2y/usx2yhwdeppcm.c
patching file usx2yhwdeppcm.c
make[3]: Leaving directory `/usr/src/alsa-driver-1.0.14rc1/usb/usx2y'
make[2]: Leaving directory `/usr/src/alsa-driver-1.0.14rc1/usb'
make[1]: Leaving directory `/usr/src/alsa-driver-1.0.14rc1'
make -C /lib/modules/2.6.20.3/source SUBDIRS=/usr/src/alsa-driver-1.0.14rc1 O=/lib/modules/2.6.20.3/build CPP="gcc -E" CC="gcc" modules
make[1]: Entering directory `/usr/src/linux-2.6.20.3'
  CC [M]  /usr/src/alsa-driver-1.0.14rc1/acore/hwdep.o
  CC [M]  /usr/src/alsa-driver-1.0.14rc1/acore/memalloc.o
  CC [M]  /usr/src/alsa-driver-1.0.14rc1/acore/sgbuf.o
  CC [M]  /usr/src/alsa-driver-1.0.14rc1/acore/memory_wrapper.o
  CC [M]  /usr/src/alsa-driver-1.0.14rc1/acore/pcm.o
In file included from /usr/src/alsa-driver-1.0.14rc1/acore/../alsa-kernel/core/pcm.c:29,
                 from /usr/src/alsa-driver-1.0.14rc1/acore/pcm.c:1:
/usr/src/alsa-driver-1.0.14rc1/include/sound/pcm.h: In function `snd_pcm_mmap_data_open':
/usr/src/alsa-driver-1.0.14rc1/include/sound/pcm.h:977: error: dereferencing pointer to incomplete type
/usr/src/alsa-driver-1.0.14rc1/include/sound/pcm.h: In function `snd_pcm_mmap_data_close':
/usr/src/alsa-driver-1.0.14rc1/include/sound/pcm.h:983: error: dereferencing pointer to incomplete type
make[4]: *** [/usr/src/alsa-driver-1.0.14rc1/acore/pcm.o] Error 1
make[3]: *** [/usr/src/alsa-driver-1.0.14rc1/acore] Error 2
make[2]: *** [_module_/usr/src/alsa-driver-1.0.14rc1] Error 2
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.20.3'
make: *** [compile] Error 2