A compilation error occurs when a variable is included in the sqrt() argument.undefined reference. What should I do?

$gccsqrtyou.c 
/usr/bin/ld: /tmp/cc0MDw2q.o:in function `main':
sqrtyou.c: (.text+0x23): undefined reference to `sqrt'
collect2:error:ld returned1 exit status

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

int main()
{
    double first = 2.0;
    double second;

    second = sqrt(first);
  // second = sqrt(2.0);

    printf("%f\n", second);
}