steps to setup the ssl connection for the C client developed using libcurl with the local host apache on ubuntu

Question

I have setup the apache on ubuntu local host using the ans no 19 of below link How do I allow HTTPS for Apache on localhost? Using all the steps described, I have generated the self signed "mykey.key" and "mycert.pem" and set it to "SSLCertificatefile" and "SSCertificateKeyFile" now I can connect to "https://localhost:443".

But when I try to run the lipcurl c program, I am getting the error "curl_easy_perform() failed: Problem with the local SSL certificate"

Here I am using the same key & certificate what I have generated in above step :mykey.key & mycert.pem.

int main(void)
{
  CURL *curl;
  CURLcode res;
  FILE *headerfile;
  const char *pPassphrase = NULL;

  static const char *pCertFile = "mycert.pem";
  static const char *pCACertFile = "/usr/local/share/ca-certificates/CACert.crt";
  static const char *pHeaderFile = "dumpit";

  const char *pKeyName;
  const char *pKeyType;

  const char *pEngine;
  headerfile = fopen(pHeaderFile, "wb");
  curl_global_init(CURL_GLOBAL_DEFAULT);
  curl = curl_easy_init();
  if(curl) {
    /* what call to write: */
    curl_easy_setopt(curl, CURLOPT_URL, "https://localhost:443");
    curl_easy_setopt(curl, CURLOPT_HEADERDATA, headerfile);

    do { /* dummy loop, just to break out from */
      if(pEngine) {
        /* use crypto engine */
        if(curl_easy_setopt(curl, CURLOPT_SSLENGINE, pEngine) != CURLE_OK) {
          /* load the crypto engine */
          fprintf(stderr, "cannot set crypto engine\n");
          break;
        }
        if(curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK) {
          /* set the crypto engine as default */
          /* only needed for the first time you load
             a engine in a curl object... */
          fprintf(stderr, "cannot set crypto engine as default\n");
          break;
        }
      }
      curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");
      curl_easy_setopt(curl, CURLOPT_SSLCERT, pCertFile);
      curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, pKeyType);
      curl_easy_setopt(curl, CURLOPT_SSLKEY, pKeyName);
      curl_easy_setopt(curl, CURLOPT_CAINFO, pCACertFile);
      curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
      res = curl_easy_perform(curl);
      if(res != CURLE_OK)
        fprintf(stderr, "curl_easy_perform() failed: %s\n",
                curl_easy_strerror(res));
    } while(0);
    /* always cleanup */
    curl_easy_cleanup(curl);
  }
  curl_global_cleanup();

  return 0;
}

here the content of "mycert.pem" & "CACert.crt" are same as I have made the copy.

please suggest, if I am missing any step