Accessing stdlib functions

I am a noob to the Arduino, but not to C. I was attempting to use the floatToString function (see playground), but it bombs on the itoa() function, which is in the stdlib.

I tried a "#include <stdlib.h>" but that doesn't work.

So what do I need to do to use this function? :-?

Larry, when I incorporate the body of floatToString() in my sketch it compiles fine.

char * floatToString(char * outstr, float value, int places, int minwidth=0, bool rightjustify=false)
{...}

void setup()
{
  char buf[100];
  floatToString(buf, 100.23, 2);
}
void loop(){}