Linker error with ofAppGlutWindow

@samuset wrote:

Hi,

I am trying to make the graphics in my sketch smoother as per the method detailed here, but I get the following errors. I pasted my main.cpp underneath. I have the ofAppGlutWindow.h in openFrameworks/app, so that’s not the problem.

Undefined symbols for architecture x86_64:
  "ofAppGlutWindow::ofAppGlutWindow()", referenced from:
      _main in main.o
  "ofAppGlutWindow::loop()", referenced from:
      void ofMainLoop::addWindow<ofAppGlutWindow>(std::__1::shared_ptr<ofAppGlutWindow>) in main.o
  "ofAppGlutWindow::setGlutDisplayString(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)", referenced from:
      _main in main.o
  "vtable for ofAppGlutWindow", referenced from:
      _main in main.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

my main.cpp:

#include "ofMain.h"
#include "ofApp.h"
#include "ofAppGlutWindow.h"

int main( )
{
    ofAppGlutWindow window;
    window.setGlutDisplayString( "rgba double samples>=4" );
    
	ofSetupOpenGL( &window, 640,640,OF_WINDOW );
	ofRunApp( new ofApp() );
}

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