On 17 May 2021, at 18:09, Will B wrote:
> 
> Following the instructions here https://www.fltk.org/doc-1.3/osissues.html , I tried to set my main window icon with the following code
> 
>     #include <X11/xpm.h>
>     fl_open_display();                // needed if display has not been previously opened
> 
>     Pixmap pm;
>     Pixmap mask;
>     XpmCreatePixmapFromData(fl_display, DefaultRootWindow(fl_display), pmSpiritvnc_xpm, &pm, &mask, NULL);
> 
>     app->mainWin->icon(reinterpret_cast<void *>(pm));
> 
> Unfortunately this gives a compile error:
> 
> In file included from /usr/include/X11/Xlib.h:47,
>                  from /usr/include/FL/x.H:37,
>                  from /usr/include/FL/fl_draw.H:27,
>                  from src/app.h:43,
>                  from src/spiritvnc.cxx:47:
> /usr/include/X11/xpm.h: In function ‘int main(int, char**)’:
> /usr/include/X11/xpm.h:286:1: error: expected unqualified-id before string constant
>  _XFUNCPROTOBEGIN
>  ^~~~~~~~~~~~~~~~
> src/spiritvnc.cxx:94:5: error: ‘XpmCreatePixmapFromData’ was not declared in this scope
>      XpmCreatePixmapFromData(fl_display, DefaultRootWindow(fl_display), pmSpiritvnc_xpm, &pm, &mask, NULL);
>      ^~~~~~~~~~~~~~~~~~~~~~~
> src/spiritvnc.cxx:94:5: note: suggested alternative: ‘XCreatePixmapFromData’
>      XpmCreatePixmapFromData(fl_display, DefaultRootWindow(fl_display), pmSpiritvnc_xpm, &pm, &mask, NULL);
>      ^~~~~~~~~~~~~~~~~~~~~~~
>      XCreatePixmapFromData
> 
> I am using antiX Linux 19.3, which is based on Debian. All the dev packages are installed and as noted on that OS Issues page, I am calling Fl_Window::show(int argc, char** argv). I also tried the XCreatePixmapFromData method, but it produces the same or similar error message. I have grepped for XpmCreatePixmapFromData in /usr/include and it does show up in X11/xpm.h.
> 
> I'm not a big Xlib user -- is there something else I should try? 


Not sure... This is a “works for me” sort of answer, but here’s some code I use. This is pretty old, so there may be better fltk’ish ways these days, but this (still) works for me.
So, amongst the headers, ifdef’d for X11 builds I have:

#  include <X11/xpm.h>
#  include "media/fn5x64.xpm”


Then in main(), just before I show the main window I have (also suitably ifdef’d, of course...)

    fl_open_display(); // Make sure the display is available before we try and change it!
    Pixmap pixmap, mask; // create pixmaps to hold the icon image and its mask
    // load the XPM and prepare the mask
    XpmCreatePixmapFromData(fl_display, DefaultRootWindow(fl_display), (char**)fn5x64_xpm_data, &pixmap, &mask, 0);
    // assign to the fltk main window
    // note that the fltk icon handling DOES NOT honour transparency,
    // so we fix that AFTER the window is shown (see below)
    main_window->icon((char*)pixmap);

    /* Show the main window */
    main_win->window->show();


Then after the window is mapped I fix up icon transparency issue with:

// The fltk icon code doesn't handle XPM transparency well, work around that here...
{
    // read in the current window hints, then modify them to allow icon transparency
    XWMHints* hints = XGetWMHints(fl_display, fl_xid(main_window));
    hints->flags |= IconMaskHint; // ensure transparency mask is enabled for the XPM icon
    hints->icon_mask = mask;      // set the transparency mask
    XSetWMHints(fl_display, fl_xid(main_window), hints);
    XFree(hints);
}


And that’s pretty much it...

I’ve no clue what causes the compiler issue you are seeing.

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