[fractal] Add missing macOS dependencies

[Daniel Garcia Moreno <danigm src gnome org>]

commit d867932e95111b9128449ea1e7b7530d9dea383b
Author: Berkus Decker <berkus+github@metta.systems>
Date:   Mon Oct 5 16:06:42 2020 +0300

    Add missing macOS dependencies

 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index a1c7430d..fc900e34 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,8 @@ sudo ninja -C _build install
 ### macOS
 
 ```sh
-brew install gtk+3 dbus bash adwaita-icon-theme
+brew install gtk+3 dbus bash adwaita-icon-theme libhandy gtksourceview4 \
+    gspell gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-editing-services
 # empirically needs 3.22.19 or later of gtk3+
 # ...and run configure as:
 /usr/local/bin/bash -c "meson . _build --prefix=/usr/local"