linux - How to compile this code implementing Xm on Ubuntu 64 bit using Netbeans? -

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i new x-windows , trying code calls simple messagebox on linux window's.

i on ubuntu 12.04lts 64bit , installed netbeans full version. included "/usr/include/xm" project, , libs, included "motif" libs.

and following error occurs when compile code:

main.cpp:24:63: error: invalid conversion ‘void (*)(widget, xtpointer, xmpushbuttoncallbackstruct*) {aka void (*)(_widgetrec*, void*, xmpushbuttoncallbackstruct*)}’ ‘xtcallbackproc {aka void (*)(_widgetrec*, void*, void*)}’ [-fpermissive] /usr/include/x11/intrinsic.h:1241:13: error:   initializing argument 3 of ‘void xtaddcallback(widget, const char*, xtcallbackproc, xtpointer)’ [-fpermissive]

i not understand error, @ least have never seen syntax like, "aka void blah blah~~".

can please me fix compile error and, if possible, please explain me error message mean?

here original source code:

#include <xm/xm.h>  #include <xm/pushb.h>  /* prototype callback function */  void pushed_fn(widget , xtpointer ,                 xmpushbuttoncallbackstruct *);   main(int argc, char **argv)   {   widget top_wid, button;     xtappcontext  app;      top_wid = xtvaappinitialize(&app, "push", null, 0,         &argc, argv, null, null);      button = xmcreatepushbutton(top_wid, "push_me", null, 0);      /* tell xt manage button */                 xtmanagechild(button);                  /* attach fn widget */     xtaddcallback(button, xmnactivatecallback, pushed_fn, null);      xtrealizewidget(top_wid); /* display widget hierarchy */     xtappmainloop(app); /* enter processing loop */   }  void pushed_fn(widget w, xtpointer client_data,                 xmpushbuttoncallbackstruct *cbs)    {         printf("don't push me!!\n");   }

xtaddcallback expects xtcallbackproc pushed_fn may compatible, isn't xtcallbackproc because uses xm types directly.

been while since i've done motif, wrong, solution might be:

void pushed_fn(widget w, xtpointer client, xtpointer cbsxt) {     xmpushbuttoncallbackstruct *cbs = (xmpushbuttoncallbackstruct*)cbsxt;     ... }

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