Note: some dependencies of gtk+ seems to only be pulled with gtk+3, gtkglext seems to require libffi.
```sh
-brew install cmake glib libffi gtk+ gtk+3 pkgconfig minizip webp coreutils gnu-sed wget sassc
+brew install cmake glib gobject-introspection libffi gtk+ gtk+3 gtk-doc pkgconfig minizip webp coreutils gnu-sed wget sassc
brew link --force gettext
```