Ok, thanks, I've just launched mandelbrot example, and it works fine. But now I trying another example(bubbles), and I have this message:
Linking .build/hello_world
/tmp/cci1nNng.ltrans0.ltrans.o: In function `initialize':
<artificial>:(.text+0x1b64): undefined reference to `sinf'
/tmp/cci1nNng.ltrans0.ltrans.o: In function `matrix':
<artificial>:(.text+0x1c22): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
../resources/ugfx/tools/gmake_scripts/compiler_gcc.mk:282: recipe for target '.build/hello_world' failed
make: *** [.build/hello_world] Error 1