These are the packages that would be merged, in order:

Calculating dependencies  ..... ..... ..... ...... done!
[ebuild  N    ] net-wireless/rt2x00-9999  USE="rt2500pci -asm -debug -rfkill -rt2400pci -rt2500usb -rt61pci -rt73usb" 0 kB [4] 

Total: 1 package (1 new), Size of downloads: 0 kB
Portage overlays:
 [1] /usr/portage/local/layman/sunrise
 [2] /usr/portage/local/layman/pro-audio
 [3] /usr/local/overlays/crossdev
 [4] /usr/local/portage

>>> Verifying ebuild Manifests...

>>> Emerging (1 of 1) net-wireless/rt2x00-9999 to /
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/2.6.22-gentoo-r2/build
 * Found sources for kernel version:
 *     2.6.22-gentoo-r2
 * Checking for suitable kernel configuration options...
  [ ok ]
>>> Unpacking source...
 * Fetching CVS module source/rt2x00 into /usr/portage/distfiles/cvs-src ...
 * Running  cvs -q -f -z1 -d ":pserver:anonymous:@rt2400.cvs.sourceforge.net:/cvsroot/rt2400" login
Logging in to :pserver:anonymous@rt2400.cvs.sourceforge.net:2401/cvsroot/rt2400
 * Running  cvs -q -f -z1 -d ":pserver:anonymous@rt2400.cvs.sourceforge.net:/cvsroot/rt2400" update -dP rt2x00-9999
 * Copying source/rt2x00 from /usr/portage/distfiles/cvs-src ...
 * CVS module source/rt2x00 is now in /var/tmp/portage/net-wireless/rt2x00-9999/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999 ...
 * Preparing rt2x00lib module
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/eeprom_93cx6/eeprom_93cx6.o
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00dev.o
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00config.o
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.o
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2500pci.o
  CC [M]  /var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00pci.o
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c: In function ‘rt2x00mac_tx_rts_cts’:
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:61: warning: passing argument 2 of ‘ieee80211_ctstoself_get’ makes pointer from integer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:61: warning: passing argument 3 of ‘ieee80211_ctstoself_get’ makes integer from pointer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:61: warning: passing argument 4 of ‘ieee80211_ctstoself_get’ makes pointer from integer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:61: warning: passing argument 5 of ‘ieee80211_ctstoself_get’ from incompatible pointer type
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:61: error: too many arguments to function ‘ieee80211_ctstoself_get’
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:65: warning: passing argument 2 of ‘ieee80211_rts_get’ makes pointer from integer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:65: warning: passing argument 3 of ‘ieee80211_rts_get’ makes integer from pointer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:65: warning: passing argument 4 of ‘ieee80211_rts_get’ makes pointer from integer without a cast
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:65: warning: passing argument 5 of ‘ieee80211_rts_get’ from incompatible pointer type
/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.c:65: error: too many arguments to function ‘ieee80211_rts_get’
make[3]: *** [/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999/rt2x00mac.o] Error 1
make[2]: *** [_module_/var/tmp/portage/net-wireless/rt2x00-9999/work/rt2x00-9999] Error 2
make[1]: *** [modules] Error 2
make: *** [default] Error 2

!!! ERROR: net-wireless/rt2x00-9999 failed.
Call stack:
  ebuild.sh, line 1632:   Called dyn_compile
  ebuild.sh, line 983:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  rt2x00-9999.ebuild, line 121:   Called linux-mod_src_compile
  linux-mod.eclass, line 516:   Called die

!!! Unable to make  KERNDIR=/usr/src/linux KERNOUT=/lib/modules/2.6.22-gentoo-r2/build  .
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/net-wireless/rt2x00-9999/temp/build.log'.