Help for preparing an FLTK plug-in opcode

# Hi,
# I'm trying to make an oscilloscope using FLTK, because the display
opcode works only on X11.
# I successfully made a very simple (sinusoidal waveform calculating)
plug-in opcode looking at the documentation: ugur2.c For this one, I
have only one question. When I compiled it and made it a .so file and
called its opcode from Csound etc.  it said that "incompatible opcode"
I understand that this is because of MYFLT is default a float and my
Csound version is double. I added a line in the ugur2.c file "#define
MYFLT double" to handle the situation, it works but I get always a
warning which says MYFLT was defined twice. (It is defined in
csound.h) How can I say to compiler that MYFLT is double without
defining it twice.

# I do not know the cause of my second question. I added some FLTK
code for creating an FLTK window, which is the first example in
the FLTK documentation. (same file with additional code from FTLK
example: ugur4.cpp) But I do not know whether I made it correct.
# The file compiled without errors. I copied the .so file under
plugins64 folder but Csound gave this warning:

WARNING: could not open library '/usr/lib/csound/plugins64/ugur4.so'
(/usr/lib/csound/plugins64/ugur4.so: undefined symbol: _Znwj)

# What may be the reason of this warning?
# My system is Ubuntustudio 8.04 and csound 5.08 double version.
# Thanks in advance!
-ugur guney-

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[ugur2.c]

---

#include "csound/csdl.h"
#include <math.h>
#define MYFLT double

typedef struct _newsaw {
OPDS h;
MYFLT *asaw;/* output pointer */
MYFLT *ifreq; /* input pointers */
long time;
} newsaw;

int newsaw_init(CSOUND *csound, newsaw *p){
  p->time = 0;
  return OK;
}

int newsaw_process(CSOUND *csound, newsaw *p){
  int i;
  int n = csound->ksmps;
  MYFLT *out = p->asaw;
  MYFLT freq = *p->ifreq;
 
  for(i=0; i<n; i++) {
    out[i] = sin(2*3.1415*freq*(p->time)/44100.0);
    p->time = p->time+1;
  }  
  return OK;
}

static OENTRY localops[] = {
{"newsaw", sizeof(newsaw), 5, "a", "i", (SUBR)newsaw_init, NULL, (SUBR)newsaw_process}
};
LINKAGE

---

[ugur4.cpp]

---

#include "csound/csdl.h"
#include <math.h>

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>

#define MYFLT double

typedef struct _newsaw {
OPDS h;
MYFLT *asin;/* output pointer */
MYFLT *ifreq; /* input pointers */
long time;
} newsin;

int newsin_init(CSOUND *csound, newsin *p){
  Fl_Window *window = new Fl_Window(300,180);
  Fl_Box *box = new Fl_Box(20,40,260,100,"Hello, World!");
  box->box(FL_UP_BOX);
  box->labelsize(36);
  box->labelfont(FL_BOLD+FL_ITALIC);
  box->labeltype(FL_SHADOW_LABEL);
  window->end();
  window->show();
  Fl::run();

  p->time = 0;
  return OK;
}

int newsin_process(CSOUND *csound, newsin *p){
  int i;
  int n = csound->ksmps;
  MYFLT *out = p->asin;
  MYFLT freq = *p->ifreq;
 
  for(i=0; i<n; i++) {
    out[i] = sin(2*3.1415*freq*(p->time)/44100.0);
    p->time = p->time+1;
  }  
  return OK;
}

static OENTRY localops[] = {
{"newsin", sizeof(newsin), 5, "a", "i", (SUBR)newsin_init, NULL, (SUBR)newsin_process}
};
LINKAGE

---