Calling qhull library in C++

qhulltest.cpp

/* Compiling command:
g++ -o Qhullex Qhullex.cpp -lqhullstatic_r -lqhullcpp

Note:
(1) this is the minimum example (user_eg3) in qhull package, also mentioned in http://www.qhull.org/html/qh-code.htm#cpp .
However, the version on the website (Dated 03/19/2019) is inconsistent with the source code and it does not pass the compiler
(2) libqhullstatic_r is the correct library to use.
    * Linking to libqhull results in runtime error
      "QH6248 qh_lib_check: Incorrect qhull library called.  Caller uses reentrant Qhull while library is non-reentrant";
    * Linking to libqhull_r results in runtime error
      "QH6231 Qhull internal error (userprintf_rbox_r.c): fp is 0.  Wrong qh_fprintf_rbox called."
 */

#include <iostream>
#include <libqhullcpp/Qhull.h>
#include <libqhullcpp/QhullFacetList.h>
#include <libqhullcpp/RboxPoints.h>

using namespace std;
using namespace orgQhull;

int main(void) {
  RboxPoints rbox("100");
  Qhull qhull;
  qhull.runQhull(rbox, "");
  QhullFacetList facets = qhull.facetList();
  cout<< facets;
}