#include <stdio.h>
#include <stdlib.h>  
#include <string.h>
#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <clamav.h>


int main(int argc,char **argv)
{
int fd,ret;
unsigned long int size = 0;
unsigned int sigs = 0;
long double mb;
const char *virname;
struct cl_engine *engine;


if(argc != 2) {
printf("Usage: %s file\n",argv[0]);
return 2;
}

if((fd = open(argv[1],O_RDONLY)) == -1) {
printf("Can't open file %s\n",argv[1]);
return 2;
}

if((ret = cl_init(CL_INIT_DEFAULT)) != CL_SUCCESS) {
printf("Can't initialize libclamav: %s\n",cl_strerror(ret));
return 2;
}

if(!(engine = cl_engine_new())) {
printf("Can't create new engine\n");
return 2;
}

/* load all available databases from default directory */
if((ret = cl_load(cl_retdbdir(),engine,&sigs,CL_DB_STDOPT)) != CL_SUCCESS) {
printf("cl_load: %s\n",cl_strerror(ret));
close(fd);
    cl_engine_free(engine);
return 2;
}

printf("Loaded %u signatures.\n",sigs);

/* build engine */
if((ret = cl_engine_compile(engine)) != CL_SUCCESS) {
printf("Database initialization error: %s\n",cl_strerror(ret));;
    cl_engine_free(engine);
close(fd);
return 2;
}

/* scan file descriptor */
if((ret = cl_scandesc(fd,&virname,&size,CL_SCAN_STDOPT)) == CL_VIRUS) {
printf("Virus detected: %s\n",virname);
} else {
if(ret == CL_CLEAN) {
    printf("No virus detected.\n");
} else {
    printf("Error: %s\n",cl_strerror(ret));
    cl_engine_free(engine);
    close(fd);
    return 2;
}
}
close(fd);

/* free memory */
cl_engine_free(engine);

/* calculate size of scanned data */
mb = size * (CL_COUNT_PRECISION / 1024) / 1024.0;
printf("Data scanned: %2.2Lf MB\n",mb);

return ret == CL_VIRUS ? 1 : 0;
}

生成以下错误
链接：致命错误LNK1181：无法打开输入文件’libclamav.lib’

请指导我