+\def\setwidthof#1\to#2%
+{\bgroup
+\setbox\scratchbox\hbox{#1}%
+\expanded{\egroup\def\noexpand#2{\the\wd\scratchbox}}}
+
+% Allow \emph{foo} (and {\emph foo}, but that's not really needed).
+\definealternativestyle[emph][\em][]
+
+% Put a bit of space betwen paragraphs, to make them easier to distinguish.
+\setupwhitespace[small]