Downloading a file

#define CURL_STATICLIB
#include <stdio.h>
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
#include <string.h>

size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) {
size_t written;
written = fwrite(ptr, size, nmemb, stream);
return written;
}

int main(void) {
CURL *curl;
FILE *fp;
CURLcode res;
char *url = "http://localhost/aaa.txt";
char outfilename[FILENAME_MAX] = "C:\\bbb.txt";
curl = curl_easy_init();
if (curl) {
fp = fopen(outfilename,"wb");
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
fclose(fp);
}
return 0;
}
when i complied this code i am getting an error which i include following.

down.c:(.text+0xf8): undefined reference to `curl_easy_init'
down.c:(.text+0x144): undefined reference to `curl_easy_setopt'
down.c:(.text+0x168): undefined reference to `curl_easy_setopt'
down.c:(.text+0x18c): undefined reference to `curl_easy_setopt'
down.c:(.text+0x198): undefined reference to `curl_easy_perform'
down.c:(.text+0x1a8): undefined reference to `curl_easy_cleanup'
collect2: ld returned 1 exit status
can anybody help me?

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