[gnome-builder] doc: add some installation pre-reqs for jhbuild

[Christian Hergert <chergert src gnome org>]

commit b0025315efd656b990c7aee7f62cc0be648d799a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 1 16:33:45 2017 -0800

    doc: add some installation pre-reqs for jhbuild

 doc/installation.rst |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/doc/installation.rst b/doc/installation.rst
index 48aec73..494a088 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -64,6 +64,17 @@ Command Line
 
 .. code-block:: sh
 
+   # Make sure you have the following packages installed before starting
+
+   # On Fedora
+   $ sudo dnf install clang-devel llvm-devel libssh2-devel
+
+   # On Ubuntu
+   $ sudo apt-get install clang-3.9 libclang-3.9-dev llvm-3.9-dev libssh2-1-dev
+
+
+.. code-block:: sh
+
    $ git clone git://git.gnome.org/jhbuild.git
    $ cd jhbuild
    $ ./autogen.sh --simple-install