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+% comment out to define
+%\def\CompileTikZFigures{}
+
+\documentclass{article}
+\usepackage{xspace}
+\usepackage{tikz}
+\ifx\CompileTikZFigures\undefined
+ \usetikzlibrary{external}
+ \tikzexternalize[prefix=pics/tikz/]
+\fi
+
+\usepackage{todonotes}
+
+\ifx\CompileTikZFigures\undefined
+ \makeatletter
+ \renewcommand{\todo}[2][]{%
+ \tikzexternaldisable%
+ \@bsphack\@todo[#1]{#2}\@esphack\ignorespaces%
+ \tikzexternalenable%
+ \xspace%
+ }
+ \makeatother
+\else
+ \makeatletter
+ \renewcommand{\todo}[2][]{%
+ \@bsphack\@todo[#1]{#2}\@esphack\ignorespaces\xspace%
+ }
+ \makeatother
+\fi
+
+\begin{document}
+Example by Marek Rjelka.
+
+\verb+\CompileTikZFigures+ is
+\ifx\CompileTikZFigures\undefined%
+ un%
+\fi%
+defined.
+
+\bigskip
+Here goes some\todo{a comment} text.
+
+\end{document}