On a Debian system using the texlive distribution you need to install the package texlive-latex-extra if you want to use the "toimage" environment. The reason is that hevea generates for each toimage environment a temporary TeX file that uses the "comment" environment (provided by the texlive-latex-extra package) and then runs latex on it to produce the image. -- Ralf Treinen Sun, 01 Sep 2013 20:01:28 +0200