我需要编写 C++ 代码来下载网页，我知道我需要 curl，我使用的是 Mac osx，所以我在 /usr/include/curl 中有 libcurl。当我编译这段代码时，我得到了这个错误：
#include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
/* example.com is redirected, so we tell libcurl to follow redirection */
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
这是错误：
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .clean-conf
rm -f -r build/Debug
rm -f dist/Debug/GNU-MacOSX/cppapplication
CLEAN SUCCESSFUL (total time: 54ms)
Undefined symbols for architecture x86_64:
"_curl_easy_cleanup", referenced from: _main in main.o
"_curl_easy_init", referenced from: _main in main.o
"_curl_easy_perform", referenced from: _main in main.o
"_curl_easy_setopt", referenced from: _main in main.o
"_curl_global_cleanup", referenced from: _main in main.o
"_curl_global_init", referenced from: _main in main.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU-MacOSX/cppapplication] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 264ms)
