I today updated to rev 10219 bevore this i could compile firmware, but now when i run make i get this error:

cc -O2 -I/home/jonathan/trunk/staging_dir/host/include -include endian.h -o /home/jonathan/trunk/build_dir/host/firmware-utils/bin/lzma2eva src/lzma2eva.c -lz
/usr/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
make[3]: *** [/home/jonathan/trunk/build_dir/host/firmware-utils/.built] Error 1
make[3]: Leaving directory `/home/jonathan/trunk/tools/firmware-utils'
make[2]: *** [tools/firmware-utils/compile] Error 2
make[2]: Leaving directory `/home/jonathan/trunk'
make[1]: *** [/home/jonathan/trunk/staging_dir/mipsel/stamp/.tools_install] Error 2
make[1]: Leaving directory `/home/jonathan/trunk'
make: *** [world] Error 2

What's wrong here?