c++ - Undefined reference error when using igraph

Question

I am using graph-0.6 on ubuntu 12.04

IDE Eclipse CDT C++

Have this example code from http://igraph.sourceforge.net/doc/html/ch04s02.html#igraph_add_vertices
When I try to compile I get

undefined reference to: igraph_vector_init and the rest of the functions.

It finds the header file and can create a graph structure (igraph_g t;)

#include <iostream>
#include <igraph.h>

using namespace std;

int main() {
igraph_t g;

igraph_attribute_table_t *
igraph_i_set_attribute_table(const igraph_attribute_table_t * table);


igraph_t g1;
igraph_vector_t v1;
int ret;

/* Create a graph */
igraph_vector_init(&v1, 8);
VECTOR(v1)[0]=0; VECTOR(v1)[1]=1;
VECTOR(v1)[2]=1; VECTOR(v1)[3]=2;
VECTOR(v1)[4]=2; VECTOR(v1)[5]=3;
VECTOR(v1)[6]=2; VECTOR(v1)[7]=2;
igraph_create(&g1, &v1, 0, 0);
igraph_vector_destroy(&v1);

/* Add more vertices */
igraph_add_vertices(&g1, 10, 0);
if (igraph_vcount(&g1) != 14) {
return 1;
}

igraph_destroy(&g1);

return 0;
}