tce-load -i compiletc git meson pango-dev gdk-pixbuf2-dev at-spi2-atk-dev Xorg-7.7-3d-dev libxkbcommon-dev libvulkan-dev graphene-dev iso-codes cups-dev colord-dev gst-plugins-bad-dev gettext gobject-introspection-dev pango-gir gdk-pixbuf2-gir atk-gir at-spi2-core-gir libsass-dev

https://download.gnome.org/sources/gtk/3.98/gtk-3.98.0.tar.xz

cd gtk-3.98.0

mkdir build
cd build

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain

ninja [5m 18.03s]
sudo ninja install

GTK 3.98.0 (4.0)

  Display backends: wayland x11
    Print backends: file cups
    Media backends: gstreamer
    Vulkan support: true
     Cloud support: false
    Colord support: auto
          Profiler: false
     Introspection: true
     Documentation: false
         Man pages: false
       Build tests: true
     Install tests: false
             Demos: true
          Examples: true