Simple c program won't compile

[Mark Phillips <mark@infoeng.flinders.edu.au>]

Hi,

The following program:


#include <stdio.h>
#include <math.h>

int main(int argv, char **argc){
  double x;

  x=sqrt(5.0);
}


does not compile.  Instead I get the errors:

$ gcc thick.c
/tmp/ccU9fgSr.o: In function `main':
/tmp/ccU9fgSr.o(.text+0x16): undefined reference to `sqrt'
collect2: ld returned 1 exit status


What is wrong?

Thanks,

Mark.

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