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diff --git a/tex/preamble.tex b/tex/preamble.tex
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+%% For a wider writing width.
+\newcommand\Wider[2][3em]{%
+\makebox[\linewidth][c]{%
+  \begin{minipage}{\dimexpr\textwidth+#1\relax}
+  \raggedright#2
+  \end{minipage}%
+  }%
+}
+
+%% TiKZ
+\usepackage{tikz}
+\usetikzlibrary{graphs}
+\usetikzlibrary{positioning}
+\tikzset{ bbox/.style={
+  rectangle,
+  minimum width=2.5cm,
+  rounded corners=2mm,
+  very thick,draw=black!50,
+  top color=white,
+  bottom color=black!20 } }
+
+\tikzset{ rbox/.style={
+    rectangle,
+    dotted,
+    minimum width=2.5cm,
+    rounded corners=2mm,
+    very thick,draw=red!50!black!50,
+    top color=white,
+    bottom color=red!50!black!20 } }
+
+\tikzset{ gbox/.style={
+    rectangle,
+    minimum width=2.5cm,
+    very thick,
+    draw=green!50!black!50,
+    top color=white,
+    bottom color=green!50!black!20 } }
+
+%% For the make demo
+\newcommand{\makedemoslide}[2] {
+  \begin{frame}{#2}
+    \begin{center}\includegraphics[width=0.8\linewidth]{#1}\end{center}
+    \footnotesize \textcolor{green!50!black}{Green boxes} are \emph{source}
+    files (hand-written), \textcolor{blue}{Blue boxes} are \emph{built}
+    files (automatically generated).
+  \end{frame}
+}
+
+%% Nodes in make-demo graph
+\tikzset{node-terminal/.style={
+  rectangle,
+  very thick,
+  draw=blue!50,
+  text centered,
+  top color=white,
+  minimum size=6mm,
+  text width=2.1cm,
+  rounded corners=3mm,
+  bottom color=blue!20,
+  font=\ttfamily}}
+
+\tikzset{node-nonterminal/.style={
+  rectangle,
+  very thick,
+  text centered,
+  top color=white,
+  text width=2.1cm,
+  minimum size=6mm,
+  draw=green!50!black!50,
+  bottom color=green!80!black!50,
+  font=\ttfamily}}
+
+\tikzset{node-makefile/.style={
+  thick,
+  rectangle,
+  anchor=south,
+  minimum width=2.6cm,
+  minimum height=5cm,
+  draw=green!50!black!50,
+  rounded corners=2mm,
+  fill=black!10!green!12!white,
+}}
+
+\tikzset{node-point/.style={
+  circle,
+  black!50,
+  inner sep=0pt,
+  minimum size=0pt,
+  fill=white}}