On 02.09.2012 09:53, Rahul Bansal wrote:
> /* example ex1.c */
> /* compile with: gcc -g -Wall ex1.c -o ex -lvirt */
> #include <stdio.h>
> #include <stdlib.h>
> #include "include/libvirt/libvirt.h"

since you are including this path assume you use
-I/path/to/libvirt/source and don't have libvirt installed in your
system. Hence you need to provide linker the path where it will find the
library:
gcc -I/path/to/libvirt -L/path/to/libvirt/src -lvirt ex1.c -o ex1

or just install libvirt ('sudo make install' in /path/to/libvirt) and
then you can drop both -I and -L arguments.

> int main(int argc, char *argv[])
> {
> virConnectPtr conn;
> conn = virConnectOpen("qemu:///system");
> if (conn == NULL) {
> fprintf(stderr, "Failed to open connection to qemu:///system\n");
> return 1;
> }
> virConnectClose(conn);
> return 0;
> }