re-compiling x264 under ubuntu 12.04

Hi, when I follow the step to install x264g from the source. I obtain this warning under Ubuntu 12.04:
It is important or I can do what they suggest?
It is important or I can do what they suggest?
media@mediastation:~/src/x264$ make
Makefile:3: config.mak: No such file or directory
./configure
Found yasm 1.1.0.2352
Minimum version is yasm-1.2.0
If you really want to compile without asm, configure with --disable-asm.
make: *** [config.mak] Error 1