help with making my own build

[pienose]

I tried to compile my own build, and I faild. I was hoping for some help from here.

ok, after running

svn co svn://svn.rockbox.org/rockbox/trunk rockbox

and it going through loads of stuff I went on to this-

Checked out revision 15252.
tim@ubuntu:~$ cd rockbox
tim@ubuntu:~/rockbox$ mkdir build
tim@ubuntu:~/rockbox$ cd build
tim@ubuntu:~/rockbox/build$ ../tools/configure
Enter target platform:
 ==Archos==            ==iriver==             ==Apple iPod==
  0) Player/Studio     10) H120/H140          20) Color/Photo
  1) Recorder          11) H320/H340          21) Nano
  2) FM Recorder       12) iHP-100/110/115    22) Video
  3) Recorder v2       13) iFP-790            23) 3G
  4) Ondio SP          14) H10 20Gb           24) 4G Grayscale
  5) Ondio FM          15) H10 5/6Gb          25) Mini 1G
  6) AV300                                    26) Mini 2G
                                              27) 1G, 2G

 ==iAudio==            ==Toshiba==            ==SanDisk==
 30) X5/X5V/X5L        40) Gigabeat F         50) Sansa e200
 31) M5/M5L            41) Gigabeat S         51) Sansa e200R
                                              52) Sansa c200

 ==Tatung==            ==Olympus==
 60) Elio TPJ-1022     70) M:Robe 500
50
Platform set to e200

Build (N)ormal, (A)dvanced, (S)imulator, (B)ootloader, (I)installer, (M)anual (N)
N
Normal build selected
Using source code root directory: /home/tim/rockbox
../tools/configure: 1599: arm-elf-gcc: not found
../tools/configure: 1603: arm-elf-ld: not found
WARNING: The compiler you must use (arm-elf-gcc) is not in your path!
WARNING: this may cause your build to fail since we cannot do the
WARNING: checks we want now.
Using arm-elf-ld 
Created Makefile
tim@ubuntu:~/rockbox/build$ make
gcc -g rdf2binary.c -o rdf2binary
gcc -g convbdf.c -o convbdf
gcc -g codepages.c codepage_tables.c -o codepages
gcc -DAPPLICATION_NAME=\"bmp2rb\" -g bmp2rb.c -o bmp2rb
gcc -O -ansi -g   -c -o scramble.o scramble.c
gcc -O -ansi -g   -c -o iriver.o iriver.c
gcc -O -ansi -g   -c -o mi4.o mi4.c
gcc -O -ansi -g   -c -o gigabeat.o gigabeat.c
gcc -O -ansi -g   -c -o gigabeats.o gigabeats.c
gcc -O -ansi -g   -c -o telechips.o telechips.c
gcc -g  scramble.o iriver.o mi4.o gigabeat.o gigabeats.o telechips.o   -o scramble
/bin/sh: arm-elf-gcc: not found
Create sysfont.h
Header parsed
/bin/sh: arm-elf-gcc: not found
CONVBDF
CC sysfont.c
Header parsed
make[1]: arm-elf-gcc: Command not found
make[1]: *** [/home/tim/rockbox/build/firmware/sysfont.o] Error 127
make: *** [build] Error 2
tim@ubuntu:~/rockbox/build$

ok so as you can see there are some errors. What seems to be the problem is this 'arm-elf-gcc' thing, but I have no idea what it is or how I can fix it.

thanks in advance!