Codes are below

What is wrong, I can't fix problem


img_lib_t ilib = NULL;
	    int rc;
**	    if (rc = (img_lib_attach(&ilib)) != IMG_ERR_OK) {
	                    fprintf(stderr, "img_lib_attach() failed: %d\n");
	                    return -1;
	            }

in double star line giving an error;"undefined reference to `img_lib_attach' "?

SOS