Too many dependencies for GtkInspector

[Fred]

I want to use GtkInspector in my GTK development through GObject Introspection in Python.

So I need to enable the GtkInspector:
$ gsettings set org.gtk.Settings.Debug enable-inspector-keybinding true
No such schema 'org.gtk.Settings.Debug'

Apparently I need the 'libgtk-3-dev' package.

$ sudo apt-get install libgtk-3-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  gir1.2-gtk-3.0 icu-devtools libatk-bridge2.0-dev libatk1.0-dev
  libatspi2.0-dev libcairo2-dev libcontent-hub-glib-dev libcontent-hub-glib0
  libdrm-dev libegl1-mesa-dev libepoxy-dev libfontconfig1-dev libfreetype6-dev
  libgail-3-0 libgdk-pixbuf2.0-dev libglib2.0-dev libglib2.0-dev-bin
  libgraphite2-dev libgtk-3-0 libgtk-3-common libharfbuzz-dev
  libharfbuzz-gobject0 libice-dev libicu-dev libmirclient-dev libmircommon-dev
  libmircookie-dev libmircore-dev libpango1.0-dev libpcre3-dev libpcrecpp0v5
  libpixman-1-dev libpng-dev libpng-tools libprotobuf-dev
  libpthread-stubs0-dev libsm-dev libwayland-bin libwayland-dev libx11-dev
  libx11-doc libx11-xcb-dev libxau-dev libxcb-dri2-0-dev libxcb-dri3-dev
  libxcb-glx0-dev libxcb-present-dev libxcb-randr0-dev libxcb-render0-dev
  libxcb-shape0-dev libxcb-shm0-dev libxcb-sync-dev libxcb-xfixes0-dev
  libxcb1-dev libxcomposite-dev libxcursor-dev libxdamage-dev libxdmcp-dev
  libxext-dev libxfixes-dev libxft-dev libxi-dev libxinerama-dev
  libxkbcommon-dev libxrandr-dev libxrender-dev libxshmfence-dev libxtst-dev
  libxxf86vm-dev wayland-protocols x11proto-composite-dev x11proto-core-dev
  x11proto-damage-dev x11proto-dri2-dev x11proto-fixes-dev x11proto-gl-dev
  x11proto-input-dev x11proto-kb-dev x11proto-randr-dev x11proto-record-dev
  x11proto-render-dev x11proto-xext-dev x11proto-xf86vidmode-dev
  x11proto-xinerama-dev xorg-sgml-doctools xtrans-dev zlib1g-dev

It wants to pull in 84 new packages. This seems like excessive coupling.
I have no interest in compiling anything from source, all I want is to use the GtkInspector.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: libgtk-3-dev (not installed)
ProcVersionSignature: Ubuntu 4.10.0-11.13-generic 4.10.1
Uname: Linux 4.10.0-11-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME-Classic:GNOME
Date: Mon Mar 13 22:03:39 2017
InstallationDate: Installed on 2013-12-26 (1172 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: gtk+3.0
UpgradeStatus: No upgrade log present (probably fresh install)

[dino99 (9d9)]

That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml