[ILUG] math.h and sqrt() function

[Lars Hecking]

> So could anyone please tell me why I get when I compile:
> [phil at jalapeno src]$ gcc mathtest.c
> /tmp/ccVM9ceB.o: In function `main':
> /tmp/ccVM9ceB.o(.text+0x38): undefined reference to `sqrt'
> /tmp/ccVM9ceB.o(.text+0x6b): undefined reference to `sqrt'
> collect2: ld returned 1 exit status

 This is possibly a good candidate for *the* most frequently asked
 C programming related question ever.
 Cf. http://www.eskimo.com/~scs/C-faq/q14.3.html.