Arduino Starter KIT programs - error compiling 07 - keyboard instrument

Hi all !

I'm a newbie regarding Arduino, so i've started with the starter kit and doing all the projects in there. I'm getting a problem with project 07 (and every one that uses sound).

When compiling the sketch, i get the following error:

core.a(Tone.cpp.o): In function `__vector_7':
/usr/share/arduino/hardware/arduino/cores/arduino/Tone.cpp:555: undefined reference to `__muluhisi3'
collect2: error: ld returned 1 exit status

I really don't know what is that...

I'm using Arduino IDE 1.0.3 in Gentoo Linux

Thanks in advance.