Compiling GTK4 in windows with Vulkan
Step 1 download and install https://www.msys2.org/
Step 3 Install toolchains
pacman -S --needed mingw-w64-x86_64-toolchain
pacman -S --needed mingw-w64-x86_64-meson
pacman -S --needed mingw-w64-x86_64-pkg-config
pacman -S --needed mingw-w64-x86_64-glib2
pacman -S --needed mingw-w64-x86_64-pango
pacman -S --needed mingw-w64-x86_64-cairo
pacman -S --needed mingw-w64-x86_64-vulkan-devel
Step 4 Install GTK4 dependencies