[avr-gcc-list] Toolchain not showing up with xmega support

[David L. Martin]

Built a new computer, installed Ubuntu 10.04.2 LTS.

Rather than use the .deb packages, I figured I would roll up a toolchain 
using these instructions: 
http://www.nongnu.org/avr-libc/user-manual/install_tools.html

Everything went well with the build, no errors, a fairly easy process.

Until I went to actually compile something.  It appears that neither 
avr-gcc nor avr-g++ have xmega support, but the assembler does???

Here is a cut down version of the output of "avr-gcc --target-help":
====================================================
The following options are target specific:
  -mcall-prologues            Use subroutines for function prologues and
                              epilogues
  -mint8                      Use an 8-bit 'int' type
  -mmcu=MCU                   Select the target MCU
  -mno-interrupts             Change the stack pointer without disabling
                              interrupts
  -mpmem-wrap-around          Make the linker relaxation machine assume 
that a
                              program counter wrap-around occures.
  -mrelax                     Relax branches
  -mshort-calls               Use rjmp/rcall (limited range) on >8K devices
  -mtiny-stack                Change only the low 8 bits of the stack 
pointer

Known MCU names:
  avr2 at90s2313 at90s2323 at90s2333 at90s2343 attiny22 attiny26 at90s4414
  at90s4433 at90s4434 at90s8515 at90c8534 at90s8535 avr25 ata6289 attiny13
  attiny13a attiny2313 attiny24 attiny44 attiny84 attiny25 attiny45
  attiny85 attiny261 attiny461 attiny861 attiny43u attiny87 attiny48
  attiny88 at86rf401 avr3 at43usb355 at76c711 avr31 atmega103 at43usb320
  avr35 at90usb82 at90usb162 atmega8u2 atmega16u2 atmega32u2 attiny167
  attiny327 avr4 atmega8 atmega48 atmega48p atmega88 atmega88p atmega8515
  atmega8535 atmega8c1 atmega8m1 atmega8hva atmega4hvd atmega8hvd at90pwm1
  at90pwm2 at90pwm2b at90pwm3 at90pwm3b at90pwm81 avr5 atmega16 atmega161
  atmega162 atmega163 atmega164p atmega165 atmega165p atmega168 atmega168p
  atmega169 atmega169p atmega32 atmega323 atmega324p atmega325 atmega325p
  atmega3250 atmega3250p atmega328p atmega329 atmega329p atmega3290
  atmega3290p atmega406 atmega64 atmega640 atmega644 atmega644p atmega645
  atmega6450 atmega649 atmega6490 atmega16hva atmega16hvb atmega32hvb
  at90can32 at90can64 at90pwm216 at90pwm316 atmega16c1 atmega32c1 
atmega64c1
  atmega16m1 atmega32m1 atmega64m1 atmega16u4 atmega32u4 atmega32u6
  at90scr100 at90usb646 at90usb647 at94k avr51 atmega128 atmega1280
  atmega1281 atmega1284p atmega128rfa1 at90can128 at90usb1286 at90usb1287
  m3000f m3000s m3001b avr6 atmega2560 atmega2561 avr1 at90s1200 attiny11
  attiny12 attiny15 attiny28

AVR Assembler options:
  -mmcu=[avr-name] select microcontroller variant
                   [avr-name] can be:
                   avr1  - classic AVR core without data RAM
                   avr2  - classic AVR core with up to 8K program memory
                   avr25 - classic AVR core with up to 8K program memory
                           plus the MOVW instruction
                   avr3  - classic AVR core with up to 64K program memory
                   avr31 - classic AVR core with up to 128K program memory
                   avr35 - classic AVR core with up to 64K program memory
                           plus the MOVW instruction
                   avr4  - enhanced AVR core with up to 8K program memory
                   avr5  - enhanced AVR core with up to 64K program memory
                   avr51 - enhanced AVR core with up to 128K program memory
                   avr6  - enhanced AVR core with up to 256K program memory
                   avrxmega3 - XMEGA, > 8K, <= 64K FLASH, > 64K RAM
                   avrxmega4 - XMEGA, > 64K, <= 128K FLASH, <= 64K RAM
                   avrxmega5 - XMEGA, > 64K, <= 128K FLASH, > 64K RAM
                   avrxmega6 - XMEGA, > 128K, <= 256K FLASH, <= 64K RAM
                   avrxmega7 - XMEGA, > 128K, <= 256K FLASH, > 64K RAM
                   or immediate microcontroller name.
  -mall-opcodes    accept all AVR opcodes, even if not supported by MCU
  -mno-skip-bug    disable warnings for skipping two-word instructions
                   (default for avr4, avr5)
  -mno-wrap        reject rjmp/rcall instructions with 8K wrap-around
                   (default for avr3, avr5)
Known MCU names:
  avr1 avr2 avr25 avr3 avr31 avr35 avr4 avr5 avr51 avr6 avrxmega1
  avrxmega2 avrxmega3 avrxmega4 avrxmega5 avrxmega6 avrxmega7 at90s1200
  attiny11 attiny12 attiny15 attiny28 at90s2313 at90s2323 at90s2333
  at90s2343 attiny22 attiny26 at90s4414 at90s4433 at90s4434 at90s8515
  at90c8534 at90s8535 attiny13 attiny13a attiny2313 attiny2313a attiny24
  attiny24a attiny4313 attiny44 attiny44a attiny84 attiny84a attiny25
  attiny45 attiny85 attiny261 attiny261a attiny461 attiny461a attiny861
  attiny861a attiny87 attiny43u attiny48 attiny88 at86rf401 ata6289
  at43usb355 at76c711 atmega103 at43usb320 attiny167 at90usb82 at90usb162
  atmega8u2 atmega16u2 atmega32u2 atmega8 atmega48 atmega48a atmega48p
  atmega88 atmega88a atmega88p atmega88pa atmega8515 atmega8535 atmega8hva
  at90pwm1 at90pwm2 at90pwm2b at90pwm3 at90pwm3b at90pwm81 atmega16
  atmega16a atmega161 atmega162 atmega163 atmega164a atmega164p atmega165
  atmega165a atmega165p atmega168 atmega168a atmega168p atmega169
  atmega169a atmega169p atmega169pa atmega32 atmega323 atmega324a
  atmega324p atmega324pa atmega325 atmega325a atmega325p atmega325pa
  atmega3250 atmega3250a atmega3250p atmega3250pa atmega328 atmega328p
  atmega329 atmega329a atmega329p atmega329pa atmega3290 atmega3290a
  atmega3290p atmega3290pa atmega406 atmega64 atmega640 atmega644
  atmega644a atmega644p atmega644pa atmega645 atmega645a atmega645p
  atmega649 atmega649a atmega649p atmega6450 atmega6450a atmega6450p
  atmega6490 atmega6490a atmega6490p atmega16hva atmega16hva2 atmega16hvb
  atmega16hvbrevb atmega32hvb atmega32hvbrevb atmega64hve at90can32
  at90can64 at90pwm161 at90pwm216 at90pwm316 atmega32c1 atmega64c1
  atmega16m1 atmega32m1 atmega64m1 atmega16u4 atmega32u4 atmega32u6
  at90usb646 at90usb647 at90scr100 at94k m3000 atmega128 atmega1280
  atmega1281 atmega1284p atmega128rfa1 at90can128 at90usb1286 at90usb1287
  atmega2560 atmega2561 atxmega16a4 atxmega16d4 atxmega16x1 atxmega32a4
  atxmega32d4 atxmega32x1 atxmega64a3 atxmega64d3 atxmega64a1 atxmega64a1u
  atxmega128a3 atxmega128b1 atxmega128d3 atxmega192a3 atxmega192d3
  atxmega256a3 atxmega256a3b atxmega256a3bu atxmega256d3 atxmega128a1
  atxmega128a1u
=========================================================

Any ideas on what I did wrong?

This is the error I get:

main.cpp:1:0: error: unrecognized argument to -mmcu= option: 'atxmega128a1'
main.cpp:1:0: note: See --target-help for supported MCUs
make: *** [main.o] Error 1