[librsvg: 6/9] Compiling.md: Add Debian testing dependancies.

[Federico Mena Quintero <federico src gnome org>]

commit 46efdbe757a866fb9b994460cd2520a2f2bcbae4
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Tue Feb 20 08:02:07 2018 +0000

    Compiling.md: Add Debian testing dependancies.

 COMPILING.md | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/COMPILING.md b/COMPILING.md
index e66eedcd..ad4c558d 100644
--- a/COMPILING.md
+++ b/COMPILING.md
@@ -25,11 +25,20 @@ explains librsvg's peculiarities.
 * Gtk+ >= 3.10
 * Rust >= "1.21"
 
-### Ubuntu based systems:
-librsvg can not be built in debian stable due to and old version of `glib`.
-librsvg can not be built in ubuntu 16.04, due to some of the dependancies provided being old.
+### Debian based systems:
+librsvg can not be built in `debian stable` and `ubuntu 16.04`, due to some of the dependancies provided 
being old.
 
-**Building on 18.04:**
+**Build depenancies on Debian Testing:**
+
+```sh
+apt install -y gcc make rustc cargo \
+automake autoconf libtool gettext itstool \
+libgdk-pixbuf2.0-dev libgirepository1.0-dev \
+gtk-doc-tools git  libgtk-3-dev \
+libxml2-dev libcroco3-dev libcairo2-dev libpango1.0-dev
+```
+
+**Build dependancies Ubuntu on 18.04 or newer:**
 
 Currently you will need to install `rustc` and `cargo` with [rustup.rs](https://rustup.rs)
 due to the `rustc` package provided from the ubuntu repo being old. This should not be the case