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  • ANNOUNCEMENT NaN GiB
    FLTK 1.4 is based on the final release of FLTK 1.3.4. Later updates
    have been backported to 1.3.5 - 1.3.10.
    
    FLTK 1.4 is intended to be mostly API compatible with FLTK 1.3.x so
    you don't need to change source code when you switch to FLTK 1.4.
    However, all programs must be recompiled with FLTK 1.4 because the
    ABI (Application Binary Interface) has changed.
    
    Potential source code conflicts are documented in chapter "Migrating
    Code from FLTK 1.3 to 1.4" of the user documentation [1].
    
    FLTK 1.4 adds some new widgets (e.g. Fl_Flex, Fl_Grid) for flexible GUI
    layout, Fl_Scheme_Choice for scheme selection by users, and more.
    Other widgets (Fl_Tabs, Fl_Tile, Fl_Spinner etc.) have been improved
    for better user experience.
    
    FLTK 1.4 supports HighDPI displays under Linux/Unix and Windows and
    improves HighDPI support on macOS. The initial screen scaling factor is
    read from the system and application windows can be zoomed (in/out/reset)
    by the user with ctrl/+/-/0 shortcuts, respectively.
    
    CMake support has been improved significantly and requires CMake 3.15 or
    higher, autotools/configure/make is still supported. The latter will be
    dropped in the next minor release (1.5.0).
    
    macOS is supported up to 15.0 "Sequoia".
    
    The platform dependent code in FLTK 1.4 was rewritten to enable easier
    porting to new platforms. Basically all platform dependent code has
    been isolated and implemented in virtual methods of "driver" classes.
    For details see 'src/drivers' and subdirectories.
    
    FLTK is now compatible with the Wayland platform on current Linux
    distributions and FreeBSD. The default build of the library on these
    platforms supports both X11 and Wayland in a "hybrid" library. Programs
    compiled and linked to this library start using Wayland if it is
    available at runtime and fall back to using X11 if not. Programs using
    X11 specific code that are not yet ported to Wayland can still be used
    on pure X11 systems or by disabling the Wayland support on startup so
    they fall back to using X11 only. This requires 'XWayland' support on
    Wayland enabled (Linux) systems.
    
    The current development branch on GitHub [2] is `master`. This will be
    changed to `branch-1.4` when development of FLTK 1.5.0 begins and 1.4
    will be switched to maintenance mode.
    
    [1] https://www.fltk.org/doc-1.4/ (HTML) and
        https://www.fltk.org/doc-1.4/fltk.pdf (PDF)
    [2] https://github.com/fltk/fltk.git