pow() function not working

My code is : #include<stdio.h> #include<math.h> #include<signal.h> int main() { int T,a,b,n,i,s1=0,l,s2=0,sum,c[1001]={0}; scanf("%d",&T); while(T--) { scanf("%d %d",&a,&b); scanf("%d",&n); l=n; for(i=0;i<n+1;i++) scanf("%d",&c[i]); for(i=0;i<n+1;i++) { s1=s1+(c[i]*pow(a,l)); l--; } l=n; for(i=0;i<n+1;i++) { s2=s2+(c[i]*pow(b,l)); l--; } sum=s1+s2; printf("%d\n",(sum%1000000007)); } return 0; } Now when i compile the error shown is : user@host# gcc -lm 9.c /tmp/ccv07Xvw.o: In function `main': 9.c:(.text+0x113): undefined reference to `pow' 9.c:(.text+0x1a0): undefined reference to `pow' collect2: ld returned 1 exit status .... So please help me with this problem as soon as possible.... Thanks in advance

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