Description
Full Compilation warnings when building fluid:

Compiling widget_panel.cxx...
widget_panel.cxx:541:43: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_LEFT", 0,  0, (void*)(FL_GRID_LEFT), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                           ^
widget_panel.cxx:542:47: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_CENTER", 0,  0, (void*)(FL_GRID_CENTER), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                               ^
widget_panel.cxx:543:45: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_RIGHT", 0,  0, (void*)(FL_GRID_RIGHT), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                             ^
widget_panel.cxx:544:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_FILL", 0,  0, (void*)(FL_GRID_HORIZONTAL), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                                 ^
widget_panel.cxx:549:41: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_TOP", 0,  0, (void*)(FL_GRID_TOP), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                         ^
widget_panel.cxx:550:47: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_CENTER", 0,  0, (void*)(FL_GRID_CENTER), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                               ^
widget_panel.cxx:551:47: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_BOTTOM", 0,  0, (void*)(FL_GRID_BOTTOM), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                               ^
widget_panel.cxx:552:47: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  {"GRID_FILL", 0,  0, (void*)(FL_GRID_VERTICAL), 0, (uchar)FL_NORMAL_LABEL, 0, 11, 0},
                                               ^
Linking fluid...

To Reproduce
Default build (./configure + make) on my Raspi (based on an old Debian Buster) issued these warnings.

FLTK Version

• Git master, commit b4cf1a9

FLTK Configure / Build Options

• make distclean
• autoconf
• ./configure
• make [-jN]

Operating System / Platform:

• Raspberry Pi
• Raspbian GNU/Linux 10 (based on Debian 10/Buster)
• g++ (Raspbian 8.3.0-6+rpi1) 8.3.0

Linux/Unix Runtime, if applicable:

• n/a (X11)

Additional context
We may want to add another cast, e.g. (void*)(fl_intptr_t)(FL_GRID_TOP), or we may use fl_voidptr(FL_GRID_TOP) (see FL/fl_casts.H).

The code in question is generated by fluid from fluid/widget_panel.fl.

I noticed these warnings on my old RPi3 (see above) but can't see them on my current Debian 12 (Bookworm) with gcc 12.2.0.

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