Run CImg library with node-gyp error - node.js

Question

I want to use CImg library to deal images in node.js,so i write an node addon to do it.
The compile is success, i run node-gyp build commond, that's ok.
But when i run the node program,the follow error occurs:
[root#localhost hcaptha]# node index.js
module.js:485
process.dlopen(filename, module.exports);
^
Error: /usr/local/nodejs/hcaptha/build/Release/hcaptha.node: undefined symbol: XSendEvent
at Object.Module._extensions..node (module.js:485:11)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/usr/local/nodejs/hcaptha/lib/hcap.js:1:75)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
the binding.gyp file is:
{
"targets":[
{
"target_name": "hcaptha",
"sources": [ "addon/hcaptha.cc" ,"addon/cap.cc"],
'cflags': ['-fexceptions','-O2','-Dcimg_use_png'],//the configure using CImg lib
'cflags_cc': ['-fexceptions','-O2','-Dcimg_use_png']
}
]
}
cap.cc code:
#include <node.h>
#include <string>
#include <iostream>
#include "cap.h"
#include "CImg-1.5.3/CImg.h"
using namespace v8;
Handle<Value> cap::create(const Arguments& args) {//create an image
HandleScope scope;
using namespace cimg_library;
CImg<unsigned char> captcha(256,64,1,3,0);//delete this line run ok!
return scope.Close(Boolean::New(1));
}
cap::cap(){};
cap::~cap(){};
index.js code:
var obj = require('../build/Release/hcaptha.node');
anyone can help me?

Answer 1

I finally find the result.
add line "libraries":['-lX11'] into the binding.gyp file,that's ok!
new binding.gyp file like this:
{
"targets":[
{
"target_name": "hcaptha",
"sources": [ "addon/hcaptha.cc" ,"addon/cap.cc"],
"cflags": ['-fexceptions','-O2','-Dcimg_use_png'],
"cflags_cc": ['-fexceptions','-O2','-Dcimg_use_png'],
"libraries":['-lX11']
}
]
}